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Promise based HTTP client for the browser and node.js

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- devcontainer.json
- - bundle-size.yml
  - lockfile-lint.yml
  - moderator.yml
  - publish.yml
  - release-branch.yml
  - run-ci.yml
  - verify-build-reproducibility.yml
  - zizmor.yml
- CODEOWNERS
- copilot-instructions.md
- dependabot.yml
- FUNDING.yml
- ISSUE_TEMPLATE.md
- PULL_REQUEST_TEMPLATE.md
- commit-msg
- - config.mts
  - search.mts
  - tokenizeSearchText.js
  - tokenizeSearchText.test.js
- - sponsors.json
- - index.md
- - index.md
- - @splidejs+splide+4.1.4.patch
- - android-chrome-192x192.png
  - android-chrome-512x512.png
  - apple-touch-icon.png
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  - logo-light.svg
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  - site.webmanifest
  - words-light.svg
  - words.svg
- - process-sponsors.js
  - selectLatestSponsorsBySlug.js
  - utils.js
- - index.md
- favicon.ico
- index.md
- package-lock.json
- package.json
- site.webmanifest
- - index.html
  - server.js
- - index.html
- - index.html
- - index.html
  - server.js
- - index.html
  - server.js
- - index.html
  - server.js
- - index.html
- - index.html
  - server.js
- improved-network-errors.md
- network_enhanced.js
- README.md
- server.js
- - adapters.js
  - fetch.js
  - http.js
  - README.md
  - xhr.js
- - CanceledError.js
  - CancelToken.js
  - isCancel.js
- - Axios.js
  - AxiosError.js
  - AxiosHeaders.js
  - buildFullPath.js
  - dispatchRequest.js
  - InterceptorManager.js
  - mergeConfig.js
  - methodList.js
  - README.md
  - setFormDataHeaders.js
  - settle.js
  - transformData.js
- - index.js
  - transitional.js
- - data.js
  - README.md
- - AxiosTransformStream.js
  - AxiosURLSearchParams.js
  - bind.js
  - buildURL.js
  - callbackify.js
  - combineURLs.js
  - composeSignals.js
  - cookies.js
  - deprecatedMethod.js
  - estimateDataURLDecodedBytes.js
  - formDataToJSON.js
  - formDataToStream.js
  - fromDataURI.js
  - Http2Sessions.js
  - HttpStatusCode.js
  - isAbsoluteURL.js
  - isAxiosError.js
  - isURLSameOrigin.js
  - normalizeURLForProtocolCheck.js
  - null.js
  - parseHeaders.js
  - parseProtocol.js
  - progressEventReducer.js
  - readBlob.js
  - README.md
  - resolveConfig.js
  - sanitizeHeaderValue.js
  - shouldBypassProxy.js
  - speedometer.js
  - spread.js
  - throttle.js
  - toFormData.js
  - toURLEncodedForm.js
  - trackStream.js
  - validator.js
  - ZlibHeaderTransformStream.js
- - index.js
- axios.js
- utils.js
- client.html
- client.js
- server.js
- axios-build-instance.js
- - adapter.browser.test.js
  - basicAuth.browser.test.js
  - cancel.browser.test.js
  - cancelToken.browser.test.js
  - cookies.browser.test.js
  - defaults.browser.test.js
  - formdata.browser.test.js
  - headers.browser.test.js
  - instance.browser.test.js
  - interceptors.browser.test.js
  - isURLSameOrigin.browser.test.js
  - options.browser.test.js
  - progress.browser.test.js
  - promise.browser.test.js
  - requests.browser.test.js
  - settle.browser.test.js
  - toFormData.browser.test.js
  - transform.browser.test.js
  - xsrf.browser.test.js
- - browser.setup.js
  - server.js
- - api.test.js
  - axios.test.js
  - axiosHeaders.test.js
  - composeSignals.test.js
  - estimateDataURLDecodedBytes.test.js
  - fromDataURI.test.js
  - parseProtocol.test.js
  - platform.test.js
  - prototypePollution.test.js
  - query.test.js
  - regression.test.js
  - syntaxCompat.test.js
  - toFormData.test.js
  - transformResponse.test.js
  - utils.test.js
- README.md
.gitignore
.npmrc
.prettierignore
.prettierrc
AGENTS.md
CHANGELOG.md
CLAUDE.md
CODE_OF_CONDUCT.md
COLLABORATOR_GUIDE.md
CONTRIBUTING.md
CONTRIBUTORS.md
ECOSYSTEM.md
eslint.config.js
gulpfile.js
index.d.cts
index.d.ts
index.js
LICENSE
MIGRATION_GUIDE.md
package-lock.json
package.json
PRE_RELEASE_CHANGELOG.md
PRE_RELEASE_DOCS.md
README.md
rollup.config.js
SECURITY.md
THREATMODEL.md
tsconfig.json
tslint.json
vitest.config.js
webpack.config.js

# Installation Guide

1. Get the code

git clone https://github.com/axios/axios

Downloads the entire project code from GitHub to your computer.

cd axios

Moves into the project folder you just downloaded.

2. Node.js

Easy Recommended

Prerequisites

Git Needed to download the project code from GitHub.
Node.js Node.js must be installed to use npm. The LTS version is recommended.

$ npm install axios

Downloads and installs the libraries listed in package.json.

$ yarn add axios

Type this command into your terminal and run it.

$ pnpm add axios

Type this command into your terminal and run it.

<script src="https://cdn.jsdelivr.net/npm/axios@1.13.2/dist/axios.min.js"></script>

Type this command into your terminal and run it.

npm ci

Type this command into your terminal and run it.

✅ After running the command, open the address shown in the terminal (usually something like http://localhost:3000) in your browser.

Pulled directly from this repo's README.

// repository documentation

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<p align="center">Promise based HTTP client for the browser and node.js</p>

<p align="center">
    <a href="https://axios.rest/"><b>Website</b></a> •
    <a href="https://axios.rest/pages/getting-started/first-steps.html"><b>Documentation</b></a>
</p>

[![npm version](https://img.shields.io/npm/v/axios.svg?style=flat-square)](https://www.npmjs.org/package/axios)
[![Build status](https://img.shields.io/github/actions/workflow/status/axios/axios/ci.yml?branch=v1.x&label=CI&logo=github&style=flat-square)](https://github.com/axios/axios/actions/workflows/ci.yml)
[![Gitpod Ready-to-Code](https://img.shields.io/badge/Gitpod-Ready--to--Code-blue?logo=gitpod&style=flat-square)](https://gitpod.io/#https://github.com/axios/axios)
[![install size](https://img.shields.io/badge/dynamic/json?url=https://packagephobia.com/v2/api.json?p=axios&query=$.install.pretty&label=install%20size&style=flat-square)](https://packagephobia.now.sh/result?p=axios)
[![npm bundle size](https://img.shields.io/bundlephobia/minzip/axios?style=flat-square)](https://bundlephobia.com/package/axios@latest)
[![npm downloads](https://img.shields.io/npm/dm/axios.svg?style=flat-square)](https://npm-stat.com/charts.html?package=axios)
[![gitter chat](https://img.shields.io/gitter/room/mzabriskie/axios.svg?style=flat-square)](https://gitter.im/mzabriskie/axios)
[![code helpers](https://www.codetriage.com/axios/axios/badges/users.svg)](https://www.codetriage.com/axios/axios)
[![Contributors](https://img.shields.io/github/contributors/axios/axios.svg?style=flat-square)](https://raw.githubusercontent.com/axios/axios/v1.x/CONTRIBUTORS.md)
[![Agent Friendly](https://agentfriendlycode.com/api/badge/github/axios/axios.svg)](https://agentfriendlycode.com/repo/32)

</div>

## Table of contents

- [Features](#features)
- [Browser support](#browser-support)
- [Installing](#installing)
  - [Package manager](#package-manager)
  - [CDN](#cdn)
- [Example](#example)
- [Axios API](#axios-api)
- [Request method aliases](#request-method-aliases)
- [Concurrency](#concurrency-deprecated)
- [Creating an instance](#creating-an-instance)
- [Instance methods](#instance-methods)
- [Request config](#request-config)
- [Response schema](#response-schema)
- [Config defaults](#config-defaults)
  - [Global axios defaults](#global-axios-defaults)
  - [Custom instance defaults](#custom-instance-defaults)
  - [Config order of precedence](#config-order-of-precedence)
- [Interceptors](#interceptors)
  - [Multiple interceptors](#multiple-interceptors)
- [Handling errors](#handling-errors)
- [Handling timeouts](#handling-timeouts)
- [Cancellation](#cancellation)
  - [AbortController](#abortcontroller)
  - [CancelToken](#canceltoken-deprecated)
- [Using application/x-www-form-urlencoded format](#using-applicationx-www-form-urlencoded-format)
  - [URLSearchParams](#urlsearchparams)
  - [Query string](#query-string-older-browsers)
  - [Automatic serialization](#automatic-serialization-to-urlsearchparams)
- [Using multipart/form-data format](#using-multipartform-data-format)
  - [FormData](#formdata)
  - [Automatic serialization](#automatic-serialization-to-formdata)
- [Posting files](#posting-files)
- [HTML form posting](#html-form-posting-browser)
- [Progress capturing](#progress-capturing)
- [Rate limiting](#rate-limiting)
- [AxiosHeaders](#axiosheaders)
- [Fetch adapter](#fetch-adapter)
  - [Custom fetch](#custom-fetch)
    - [Using with Tauri](#using-with-tauri)
    - [Using with SvelteKit](#using-with-sveltekit)
- [HTTP/2 support](#http2-support)
- [Semver](#semver)
- [Promises](#promises)
- [TypeScript](#typescript)
- [Contributing](#contributing)
  - [Local setup](#local-setup)
- [Resources](#resources)
- [Credits](#credits)
- [License](#license)

## Features

- Make [XMLHttpRequests](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest) from the browser.
- Make [http](https://nodejs.org/api/http.html) requests from Node.js.
- Use the [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise) API for asynchronous request handling.
- Intercept requests and responses to add custom logic or transform data.
- Transform request and response data.
- Cancel requests with built-in cancellation APIs.
- Serialize and parse [JSON](https://www.json.org/json-en.html) data.
- Serialize data objects to `multipart/form-data` or `application/x-www-form-urlencoded`.
- Add client-side protection against [Cross-Site Request Forgery](https://en.wikipedia.org/wiki/Cross-site_request_forgery).

## Browser support

|                                                     Chrome                                                     |                                                      Firefox                                                      |                                                     Safari                                                     |                                                    Opera                                                    |                                                   Edge                                                   |
| :------------------------------------------------------------------------------------------------------------: | :---------------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------------------------------------: | :---------------------------------------------------------------------------------------------------------: | :------------------------------------------------------------------------------------------------------: |
| ![Chrome browser logo](https://raw.githubusercontent.com/alrra/browser-logos/main/src/chrome/chrome_48x48.png) | ![Firefox browser logo](https://raw.githubusercontent.com/alrra/browser-logos/main/src/firefox/firefox_48x48.png) | ![Safari browser logo](https://raw.githubusercontent.com/alrra/browser-logos/main/src/safari/safari_48x48.png) | ![Opera browser logo](https://raw.githubusercontent.com/alrra/browser-logos/main/src/opera/opera_48x48.png) | ![Edge browser logo](https://raw.githubusercontent.com/alrra/browser-logos/main/src/edge/edge_48x48.png) |
|                                                    Latest ✔                                                    |                                                     Latest ✔                                                      |                                                    Latest ✔                                                    |                                                  Latest ✔                                                   |                                                 Latest ✔                                                 |

[![Browser Matrix](https://saucelabs.com/open_sauce/build_matrix/axios.svg)](https://saucelabs.com/u/axios)

## Installing

### Package manager

Using npm:

```bash
$ npm install axios
```

Using yarn:

```bash
$ yarn add axios
```

Using pnpm:

```bash
$ pnpm add axios
```

Using bun:

```bash
$ bun add axios
```

Using Deno:

```bash
$ deno add axios
```

Once the package is installed, import it with `import` or `require`:

```js
import axios, { isCancel, AxiosError } from 'axios';
```

You can also use the default export, since the named export is just a re-export from the Axios factory:

```js
import axios from 'axios';

console.log(axios.isCancel('something'));
```

If you use `require` for importing, **only the default export is available**:

```js
const axios = require('axios');

console.log(axios.isCancel('something'));
```

Some bundlers and ES6 linters need this form:

```js
import { default as axios } from 'axios';
```

In custom or legacy environments, you can import the bundle directly:

```js
const axios = require('axios/dist/browser/axios.cjs'); // browser commonJS bundle (ES2017)
// const axios = require('axios/dist/node/axios.cjs'); // node commonJS bundle (ES2017)
```

### CDN

Using jsDelivr CDN (ES5 UMD browser module):

```html
<script src="https://cdn.jsdelivr.net/npm/axios@1.13.2/dist/axios.min.js"></script>
```

Using unpkg CDN:

```html
<script src="https://unpkg.com/axios@1.13.2/dist/axios.min.js"></script>
```

## Example

```js
import axios from 'axios';
//const axios = require('axios'); // legacy way

try {
  const response = await axios.get('/user?ID=12345');
  console.log(response);
} catch (error) {
  console.error(error);
}

// Optionally the request above could also be done as
axios
  .get('/user', {
    params: {
      ID: 12345,
    },
    timeout: 5000, // 5 seconds. See "Handling Timeouts" below for matching error handling
  })
  .then(function (response) {
    console.log(response);
  })
  .catch(function (error) {
    console.log(error);
  })
  .finally(function () {
    // always executed
  });

// Want to use async/await? Add the `async` keyword to your outer function/method.
async function getUser() {
  try {
    // Example: GET request with query parameters
    const response = await axios.get('/user', {
      params: {
        ID: 12345,
      },
    });

// Using the `params` option improves readability and automatically formats query strings

console.log(response);
  } catch (error) {
    console.error(error);
  }
}
```

> Note: Set a `timeout` in production. Without one, a stalled request can hang
> indefinitely. See [Handling Timeouts](#handling-timeouts) for the matching error handling.

> Note: `async/await` is part of ECMAScript 2017 and is not supported in Internet
> Explorer and older browsers, so use with caution.

Performing a `POST` request

```js
const response = await axios.post('/user', {
  firstName: 'Fred',
  lastName: 'Flintstone',
});
console.log(response);
```

Performing multiple concurrent requests

```js
function getUserAccount() {
  return axios.get('/user/12345');
}

function getUserPermissions() {
  return axios.get('/user/12345/permissions');
}

Promise.all([getUserAccount(), getUserPermissions()]).then(function (results) {
  const acct = results[0];
  const perm = results[1];
});
```

## axios API

Requests can be made by passing the relevant config to `axios`.

##### axios(config)

```js
// Send a POST request
axios({
  method: 'post',
  url: '/user/12345',
  data: {
    firstName: 'Fred',
    lastName: 'Flintstone',
  },
});
```

```js
// GET request for remote image in node.js
import fs from 'fs';
const response = await axios({
  method: 'get',
  url: 'https://bit.ly/2mTM3nY',
  responseType: 'stream',
});
response.data.pipe(fs.createWriteStream('ada_lovelace.jpg'));
```

##### axios(url[, config])

```js
// Send a GET request (default method)
axios('/user/12345');
```

### Request method aliases

For convenience, aliases have been provided for all common request methods.

##### axios.request(config)

##### axios.get(url[, config])

##### axios.delete(url[, config])

##### axios.head(url[, config])

##### axios.options(url[, config])

##### axios.post(url[, data[, config]])

##### axios.put(url[, data[, config]])

##### axios.patch(url[, data[, config]])

###### Note

When using the alias methods `url`, `method`, and `data` properties don't need to be specified in config.

### Concurrency (deprecated)

Use `Promise.all` instead of these helpers.

Helper functions for dealing with concurrent requests.

axios.all(iterable)
axios.spread(callback)

### Creating an instance

You can create a new instance of axios with a custom config.

##### axios.create([config])

```js
const instance = axios.create({
  baseURL: 'https://some-domain.com/api/',
  timeout: 1000,
  headers: { 'X-Custom-Header': 'foobar' },
});
```

### Instance methods

The following instance methods are available. Axios merges the specified config with the instance config.

##### axios#request(config)

##### axios#get(url[, config])

##### axios#delete(url[, config])

##### axios#head(url[, config])

##### axios#options(url[, config])

##### axios#post(url[, data[, config]])

##### axios#put(url[, data[, config]])

##### axios#patch(url[, data[, config]])

##### axios#getUri([config])

## Request config

### Security notice: decompression-bomb protection is opt-in

By default `maxContentLength` and `maxBodyLength` are `-1` (unlimited). A malicious or compromised server can return a tiny gzip/deflate/brotli/zstd body that expands to gigabytes and exhaust the Node.js process.

If you call servers you do not fully trust, **set a cap**:

```js
axios.defaults.maxContentLength = 10 * 1024 * 1024; // 10 MB
axios.defaults.maxBodyLength = 10 * 1024 * 1024;
```

See the [security guide](https://axios.rest/pages/misc/security.html) for details.

These config options are available for requests. Only `url` is required. Requests default to `GET` when `method` is not set.

```js
{
  // `url` is the server URL for the request
  url: '/user',

// `method` is the request method to be used when making the request
  method: 'get', // default

// Axios prepends `baseURL` to `url` unless `url` is absolute and `allowAbsoluteUrls` is set to true.
  // It can be convenient to set `baseURL` for an instance of axios to pass relative URLs
  // to the methods of that instance.
  // `baseURL` is not a security boundary. If `url` is attacker-controlled, validate it
  // before passing it to axios. Relative URLs can contain `..` segments that resolve
  // outside an intended path prefix after the final URL is parsed.
  // HTTP(S) URLs must include `//` after the protocol. Values such as
  // `https:example.com` and `https:/example.com` are rejected with ERR_INVALID_URL.
  baseURL: 'https://some-domain.com/api/',

// `allowAbsoluteUrls` determines whether or not absolute URLs will override a configured `baseUrl`.
  // When set to true (default), absolute values for `url` will override `baseUrl`.
  // When set to false, absolute values for `url` will always be prepended by `baseUrl`.
  allowAbsoluteUrls: true,

// `transformRequest` allows changes to the request data before it is sent to the server
  // This is only applicable for request methods 'PUT', 'POST', 'PATCH' and 'DELETE'
  // The last function in the array must return a string or an instance of Buffer, ArrayBuffer,
  // FormData or Stream
  // You may modify the headers object.
  transformRequest: [function (data, headers) {
    // Do whatever you want to transform the data

return data;
  }],

// `transformResponse` allows changes to the response data to be made before
  // it is passed to then/catch
  transformResponse: [function (data) {
    // Do whatever you want to transform the data

return data;
  }],

// `parseReviver` is an optional function passed as the
  // second argument (reviver) to JSON.parse()
  parseReviver: function (key, value, context) {
    // In modern environments, context.source provides the raw JSON string
    // allowing for precision-safe parsing of BigInt
    if (typeof value === 'number' && context?.source) {
      const isInteger = Number.isInteger(value);
      const isUnsafe = !Number.isSafeInteger(value);
      const isValidIntegerString = /^-?\d+$/.test(context.source);

if (isInteger && isUnsafe && isValidIntegerString) {
        try {
          return BigInt(context.source);
        } catch {
          // Fallback: return original value if parsing fails
        }
      }
    }
    return value;
  },

// `headers` are custom headers to be sent
  headers: {'X-Requested-With': 'XMLHttpRequest'},

// `params` are the URL parameters to be sent with the request
  // Must be a plain object or a URLSearchParams object
  params: {
    ID: 12345
  },

// `paramsSerializer` is an optional config that allows you to customize serializing `params`.
  paramsSerializer: {

// Custom encoder function which sends key/value pairs in an iterative fashion.
    encode?: (param: string): string => { /* Do custom operations here and return transformed string */ },

// Custom serializer function for the entire parameter. Allows the user to mimic pre 1.x behaviour.
    serialize?: (params: Record<string, any>, options?: ParamsSerializerOptions ),

// Configuration for formatting array indexes in the params.
    indexes: false, // Three available options: (1) indexes: null (leads to no brackets), (2) (default) indexes: false (leads to empty brackets), (3) indexes: true (leads to brackets with indexes).

// Maximum object nesting depth when serializing params. Payloads deeper than this throw an
    // AxiosError with code ERR_FORM_DATA_DEPTH_EXCEEDED. Default: 100. Set to Infinity to disable.
    maxDepth: 100

// `data` is the data to be sent as the request body
  // Only applicable for request methods 'PUT', 'POST', 'DELETE', and 'PATCH'
  // `data` is request-specific: axios does not inherit or deep-merge it from defaults.
  // To add shared body fields, use a request interceptor or transformRequest.
  // When no `transformRequest` is set, it must be of one of the following types:
  // - string, plain object, ArrayBuffer, ArrayBufferView, URLSearchParams
  // - Browser only: FormData, File, Blob
  // - React Native: FormData
  // - Node only: Stream, Buffer, FormData (form-data package)
  data: {
    firstName: 'Fred'
  },

// `formDataHeaderPolicy` controls how node.js FormData#getHeaders() is copied.
  // 'legacy' (default) copies all returned headers for v1 compatibility.
  // 'content-only' copies only Content-Type and Content-Length.
  formDataHeaderPolicy: 'legacy',

// syntax alternative to send data into the body
  // method post
  // only the value is sent, not the key
  data: 'Country=Brasil&City=Belo Horizonte',

// `timeout` specifies the number of milliseconds before the request times out.
  // If the request takes longer than `timeout`, Axios aborts it.
  timeout: 1000, // default is `0` (no timeout)

// `withCredentials` indicates whether or not cross-site Access-Control requests
  // should be made using credentials
  // This only controls whether the browser sends credentials.
  // It does not control whether the XSRF header is added.
  withCredentials: false, // default

// `adapter` allows custom handling of requests which makes testing easier.
  // Return a promise and supply a valid response (see lib/adapters/README.md)
  adapter: function (config) {
    /* ... */
  },
  // Also, you can set the name of the built-in adapter, or provide an array with their names
  // to choose the first available in the environment
  adapter: 'xhr', // 'fetch' | 'http' | ['xhr', 'http', 'fetch']

// `auth` indicates that HTTP Basic auth should be used, and supplies credentials.
  // This will set an `Authorization` header, overwriting any existing
  // `Authorization` custom headers you have set using `headers`.
  // If `auth` is omitted, the Node.js HTTP and fetch adapters can read
  // HTTP Basic auth credentials from the request URL, for example
  // `https://user:pass@example.com`. Axios decodes percent-encoded URL
  // credentials, and `auth` takes precedence over URL-embedded credentials.
  // The Node.js HTTP adapter preserves Basic auth on same-origin redirects
  // and strips it on cross-origin redirects.
  // Please note that only HTTP Basic auth is configurable through this parameter.
  // For Bearer tokens and such, use `Authorization` custom headers instead.
  auth: {
    username: 'janedoe',
    password: 's00pers3cret'
  },

// `responseType` indicates the type of data that the server will respond with
  // options are: 'arraybuffer', 'document', 'json', 'text', 'stream'
  //   browser only: 'blob'
  responseType: 'json', // default

// `responseEncoding` indicates encoding to use for decoding responses (Node.js only)
  // Note: Ignored for `responseType` of 'stream' or client-side requests
  // options are: 'ascii', 'ASCII', 'ansi', 'ANSI', 'binary', 'BINARY', 'base64', 'BASE64', 'base64url',
  // 'BASE64URL', 'hex', 'HEX', 'latin1', 'LATIN1', 'ucs-2', 'UCS-2', 'ucs2', 'UCS2', 'utf-8', 'UTF-8',
  // 'utf8', 'UTF8', 'utf16le', 'UTF16LE'
  responseEncoding: 'utf8', // default

// `xsrfCookieName` is the name of the cookie to use as a value for the xsrf token
  xsrfCookieName: 'XSRF-TOKEN', // default

// `xsrfHeaderName` is the name of the http header that carries the xsrf token value
  xsrfHeaderName: 'X-XSRF-TOKEN', // default

// `withXSRFToken` defines whether to send the XSRF header in browser requests.
  // `undefined` (default) - set XSRF header only for the same origin requests
  // `true` - always set XSRF header, including for cross-origin requests
  // `false` - never set XSRF header
  // function - resolve with custom logic; receives the internal config object
  withXSRFToken: boolean | undefined | ((config: InternalAxiosRequestConfig) => boolean | undefined),

// `withXSRFToken` controls whether Axios reads the XSRF cookie and sets the XSRF header.
  // - `undefined` (default): the XSRF header is set only for same-origin requests.
  // - `true`: attempt to set the XSRF header for all requests (including cross-origin).
  // - `false`: never set the XSRF header.
  // - function: a callback that receives the request `config` and returns `true`,
  //   `false`, or `undefined` to decide per-request behavior.
  //
  // Note about `withCredentials`: `withCredentials` controls whether cross-site
  // requests include credentials (cookies and HTTP auth). In older Axios versions,
  // setting `withCredentials: true` implicitly caused Axios to set the XSRF header
  // for cross-origin requests. Newer Axios separates these concerns: to allow the
  // XSRF header to be sent for cross-origin requests you should set both
  // `withCredentials: true` and `withXSRFToken: true`.
  //
  // Example:
  // axios.get('/user', { withCredentials: true, withXSRFToken: true });

// `onUploadProgress` allows handling of progress events for uploads
  // browser & node.js
  onUploadProgress: function ({loaded, total, progress, bytes, estimated, rate, upload = true}) {
    // Do whatever you want with the Axios progress event
  },

// `onDownloadProgress` allows handling of progress events for downloads
  // browser & node.js
  onDownloadProgress: function ({loaded, total, progress, bytes, estimated, rate, download = true}) {
    // Do whatever you want with the Axios progress event
  },

// `maxContentLength` defines the max size of the response content in bytes.
  // It is enforced by the Node.js HTTP adapter and the fetch adapter.
  maxContentLength: 2000,

// `maxBodyLength` defines the max size of the request content in bytes.
  // It is enforced by the Node.js HTTP adapter and the fetch adapter when the body length can be determined.
  maxBodyLength: 2000,

// `redact` masks matching config keys when AxiosError#toJSON() is called.
  // Matching is case-insensitive and recursive. It does not change the request.
  redact: ['authorization', 'password'],

// `validateStatus` defines whether to resolve or reject the promise for a given
  // HTTP response status code. If `validateStatus` returns `true` or is set to
  // `null`, Axios resolves the promise; otherwise, Axios rejects it.
  // Explicit `validateStatus: undefined` resolves every status by default for
  // backward compatibility. Set `transitional.validateStatusUndefinedResolves`
  // to `false` to make explicit `undefined` behave as if this option was omitted.
  validateStatus: function (status) {
    return status >= 200 && status < 300; // default
  },

// `maxRedirects` defines the maximum number of redirects to follow in node.js.
  // If set to 0, Axios follows no redirects.
  maxRedirects: 21, // default

// `sensitiveHeaders` (Node only option) lists custom secret-bearing headers
  // (such as `X-API-Key`) to remove from cross-origin redirects. Matching is
  // case-insensitive. Same-origin redirects keep these headers. If
  // `maxRedirects` is 0, this option is not used.
  sensitiveHeaders: ['X-API-Key'],

// `beforeRedirect` defines a function that Axios calls before redirect.
  // Use this to adjust the request options upon redirecting,
  // to inspect the latest response headers,
  // or to cancel the request by throwing an error
  // If maxRedirects is set to 0, `beforeRedirect` is not used.

beforeRedirect: (options, { headers }) => {
    if (
      options.hostname === "example.com" &&
      options.protocol === "https:"
    ) {
      options.auth = "user:password";
    }
  },
  // Security note:
  // The `beforeRedirect` hook runs after sensitive headers are stripped during redirects.
  // `follow-redirects` removes credentials on protocol downgrades
  // (HTTPS to HTTP). Because `beforeRedirect` runs after that step,
  // re-injecting credentials without checking the destination can expose
  // sensitive data. Only add credentials for trusted HTTPS destinations.

// `socketPath` defines a UNIX Socket to be used in node.js.
  // e.g. '/var/run/docker.sock' to send requests to the docker daemon.
  // Only either `socketPath` or `proxy` can be specified.
  // If both are specified, `socketPath` is used.
  //
  // Security: when `socketPath` is set, hostname/port of the URL are ignored,
  // which bypasses hostname-based SSRF protections. Never derive `socketPath`
  // from untrusted input. Use `allowedSocketPaths` (below) to restrict accepted
  // socket paths for defense-in-depth.
  socketPath: null, // default

// `allowedSocketPaths` restricts which `socketPath` values are accepted.
  // Accepts a string or array of strings. Entries and the incoming socketPath
  // are compared after path.resolve(). A mismatch throws AxiosError with code
  // `ERR_BAD_OPTION_VALUE`. When null/undefined, no restriction is applied.
  allowedSocketPaths: null, // default

// `transport` determines the transport method for the request.
  // If defined, Axios uses it. Otherwise, if `maxRedirects` is 0,
  // Axios uses the default `http` or `https` library, depending on the protocol specified in `protocol`.
  // Otherwise, Axios uses the `httpFollow` or `httpsFollow` library, again depending on the protocol,
  // which can handle redirects.
  transport: undefined, // default

// `httpAgent` and `httpsAgent` define a custom agent to be used when performing http
  // and https requests, respectively, in node.js. This allows options to be added like
  // `keepAlive` that are not enabled by default before Node.js v19.0.0. After Node.js
  // v19.0.0, you no longer need to customize the agent to enable `keepAlive` because
  // `http.globalAgent` has `keepAlive` enabled by default.
  httpAgent: new http.Agent({ keepAlive: true }),
  httpsAgent: new https.Agent({ keepAlive: true }),

// `proxy` defines the hostname, port, and protocol of the proxy server.
  // You can also define your proxy using the conventional `http_proxy` and
  // `https_proxy` environment variables. If you are using environment variables
  // for your proxy configuration, you can also define a `no_proxy` environment
  // variable as a comma-separated list of domains that should not be proxied.
  // Use `false` to disable proxies, ignoring environment variables.
  // On Node.js versions with native environment proxy support, axios defers
  // environment proxy handling to Node when the selected agent has `proxyEnv`
  // enabled, including processes started with `NODE_USE_ENV_PROXY=1`,
  // `--use-env-proxy`, or `NODE_OPTIONS=--use-env-proxy`. Custom agents without
  // `proxyEnv` continue to use axios environment proxy resolution. Explicit
  // `proxy` config is still handled by axios.
  // `auth` indicates that HTTP Basic auth should be used to connect to the proxy, and
  // supplies credentials.
  // For `http://` targets, axios sends the request to the proxy in
  // forward-proxy mode and stamps `Proxy-Authorization` onto the request
  // headers (overwriting any user-supplied `Proxy-Authorization` header).
  // For `https://` targets, axios establishes a CONNECT tunnel through the
  // proxy and performs TLS end-to-end with the origin; `Proxy-Authorization`
  // is sent on the CONNECT request only, never on the wrapped TLS request,
  // so the proxy never sees the URL, headers, or body. Axios forwards
  // `httpsAgent` TLS options such as `ca`, `cert`, `key`, and
  // `rejectUnauthorized` to the generated tunneling agent, so they still apply
  // to the origin TLS connection.
  // If you supply an `HttpsProxyAgent`, axios leaves tunneling to that agent.
  // If the proxy server uses HTTPS, then you must set the protocol to `https`.
  // A user-supplied `Host` header in `headers` is preserved when forwarding
  // through a proxy (case-insensitive match on `host`/`Host`/`HOST`); this
  // lets you target a virtual host that differs from the request URL, for
  // example, hitting `127.0.0.1:4000` while having the proxy treat the
  // request as `example.com`. If no `Host` header is supplied, axios
  // defaults it to the request URL's `hostname:port` as before. The Host
  // header is only set in forward-proxy mode (HTTP targets); for HTTPS
  // tunneling the Host header is sent inside the TLS connection, not seen
  // by the proxy.
  proxy: {
    protocol: 'https',
    host: '127.0.0.1',
    // hostname: '127.0.0.1' // Takes precedence over 'host' if both are defined
    port: 9000,
    auth: {
      username: 'mikeymike',
      password: 'rapunz3l'
    }
  },

// `cancelToken` specifies a cancel token that can be used to cancel the request
  // (see Cancellation section below for details)
  cancelToken: new CancelToken(function (cancel) {
  }),

// an alternative way to cancel Axios requests using AbortController
  signal: new AbortController().signal,

// `decompress` indicates whether or not the response body should be decompressed
  // automatically. If set to `true` will also remove the 'content-encoding' header
  // from the responses objects of all decompressed responses
  // Axios supports gzip, deflate, brotli, and zstd when the current Node.js
  // runtime provides the corresponding zlib decompressor.
  // - Node only (XHR cannot turn off decompression)
  decompress: true, // default

// `insecureHTTPParser` boolean.
  // Indicates where to use an insecure HTTP parser that accepts invalid HTTP headers.
  // This may allow interoperability with non-conformant HTTP implementations.
  // Using the insecure parser should be avoided.
  // see options https://nodejs.org/dist/latest-v12.x/docs/api/http.html#http_http_request_url_options_callback
  // see also https://nodejs.org/en/blog/vulnerability/february-2020-security-releases/#strict-http-header-parsing-none
  insecureHTTPParser: undefined, // default

// transitional options for backward compatibility that may be removed in the newer versions
  transitional: {
    // silent JSON parsing mode
    // `true`  - ignore JSON parsing errors and set response.data to null if parsing failed (old behaviour)
    // `false` - throw SyntaxError if JSON parsing failed
    // Important: this option only takes effect when `responseType` is explicitly set to 'json'.
    // When `responseType` is omitted (defaults to no value), axios uses `forcedJSONParsing`
    // to attempt JSON parsing, but will silently return the raw string on failure regardless
    // of this setting. To have invalid JSON throw errors, use:
    //   { responseType: 'json', transitional: { silentJSONParsing: false } }
    silentJSONParsing: true, // default value for the current Axios version

// try to parse the response string as JSON even if `responseType` is not 'json'
    forcedJSONParsing: true,

// throw ETIMEDOUT error instead of generic ECONNABORTED on request timeouts
    clarifyTimeoutError: false,

// keep explicit `validateStatus: undefined` resolving every response status
    // for backward compatibility. Set to false to make explicit undefined behave
    // as if validateStatus was omitted.
    validateStatusUndefinedResolves: true,

// advertise `zstd` in the default Accept-Encoding header when the current
    // Node.js runtime supports zstd decompression. Axios still decompresses
    // zstd responses when support exists and `decompress` is true.
    advertiseZstdAcceptEncoding: false,

// use the legacy interceptor request/response ordering
    legacyInterceptorReqResOrdering: true, // default
  },

env: {
    // The FormData class to be used to automatically serialize the payload into a FormData object
    FormData: window?.FormData || global?.FormData
  },

formSerializer: {
      visitor: (value, key, path, helpers) => {}; // custom visitor function to serialize form values
      dots: boolean; // use dots instead of brackets format
      metaTokens: boolean; // keep special endings like {} in parameter key
      indexes: boolean; // array indexes format null - no brackets, false - empty brackets, true - brackets with indexes
      maxDepth: 100; // maximum object nesting depth; throws AxiosError (ERR_FORM_DATA_DEPTH_EXCEEDED) if exceeded. Set to Infinity to disable.
  },

// http adapter only (node.js)
  maxRate: [
    100 * 1024, // 100KB/s upload limit,
    100 * 1024  // 100KB/s download limit
  ]
}
```

For custom secret-bearing headers in Node.js, list them in `sensitiveHeaders` so Axios removes them when following a redirect to another origin:

```js
axios.get('https://api.example.com/users', {
  headers: { 'X-API-Key': 'secret' },
  sensitiveHeaders: ['X-API-Key'],
});
```

### Strict RFC 3986 percent-encoding for query params

By default, axios decodes `%3A`, `%24`, `%2C` and `%20` back to `:`, `$`, `,` and `+` for readability (the `+` follows the `application/x-www-form-urlencoded` convention for spaces in query strings). These characters are valid in a query component under [RFC 3986](https://datatracker.ietf.org/doc/html/rfc3986#section-3.4), so the default output is correct, but some backends require strict percent-encoding and reject the readable form.

Override the default encoder via `paramsSerializer.encode`:

```js
// Per-request: emit strict RFC 3986 percent-encoding for query values
axios.get('/foo', {
  params: { filter: JSON.stringify({ startedAt: '2026-01-23' }) },
  paramsSerializer: { encode: encodeURIComponent },
});

// Or set it on the instance defaults
const client = axios.create({
  paramsSerializer: { encode: encodeURIComponent },
});
```

## HTTP/2 support

Axios has experimental HTTP/2 support in the Node.js HTTP adapter.

Support depends on the runtime environment and Node.js version. Redirects and some adapter behavior may differ from HTTP/1.1.

Options like `httpVersion` and `http2Options` are adapter-specific and may not work the same way in every environment.

If you need HTTP/2, check runtime support or use a custom adapter.

## Response schema

The response to a request contains the following information.

```js
{
  // `data` is the response that was provided by the server
  data: {},

// `status` is the HTTP status code from the server response
  status: 200,

// `statusText` is the HTTP status message from the server response
  statusText: 'OK',

// `headers` the HTTP headers that the server responded with
  // All header names are lowercase and can be accessed using the bracket notation.
  // Example: `response.headers['content-type']`
  headers: {},

// `config` is the config that was provided to `axios` for the request
  config: {},

// `request` is the request that generated this response
  // It is the last ClientRequest instance in node.js (in redirects)
  // and an XMLHttpRequest instance in the browser
  request: {}
}
```

When using `then`, you receive the response like this:

```js
const response = await axios.get('/user/12345');
console.log(response.data);
console.log(response.status);
console.log(response.statusText);
console.log(response.headers);
console.log(response.config);
```

When using `catch`, or passing a [rejection callback](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/then) as the second parameter of `then`, read the response from the `error` object. See [Handling errors](#handling-errors).

## Config defaults

Config defaults apply to every request.

### Global axios defaults

```js
axios.defaults.baseURL = 'https://api.example.com';

// Important: If you use axios with multiple domains, Axios sends AUTH_TOKEN to all of them.
// See below for an example using Custom instance defaults instead.
axios.defaults.headers.common['Authorization'] = AUTH_TOKEN;

axios.defaults.headers.post['Content-Type'] = 'application/x-www-form-urlencoded';
```

### Custom instance defaults

```js
// Set config defaults when creating the instance
const instance = axios.create({
  baseURL: 'https://api.example.com',
});

// Alter defaults after instance has been created
instance.defaults.headers.common['Authorization'] = AUTH_TOKEN;
```

### Config order of precedence

Axios merges config in this order: library defaults from [lib/defaults/index.js](https://github.com/axios/axios/blob/main/lib/defaults/index.js#L49), the instance `defaults` property, and the request `config` argument. Later values take precedence over earlier ones.

Some options are request-specific and are only taken from the request `config`. `data` is one of those options: axios does not inherit or deep-merge request bodies from global or instance defaults. If every request needs shared body fields, add them with a request interceptor or `transformRequest`, and scope that logic carefully so sensitive values are not sent to the wrong endpoint.

```js
// Create an instance using the config defaults provided by the library
// At this point the timeout config value is `0` as is the default for the library
const instance = axios.create();

// Override timeout default for the library
// Now all requests using this instance will wait 2.5 seconds before timing out
instance.defaults.timeout = 2500;

// Override timeout for this request as it's known to take a long time
instance.get('/longRequest', {
  timeout: 5000,
});
```

## Interceptors

You can intercept requests or responses before methods like `.get()` or `.post()`
resolve their promises (before code inside `then` or `catch`, or after `await`)

```js
const instance = axios.create();

// Add a request interceptor
instance.interceptors.request.use(
  function (config) {
    // Do something before the request is sent
    return config;
  },
  function (error) {
    // Do something with the request error
    return Promise.reject(error);
  }
);

// Add a response interceptor
instance.interceptors.response.use(
  function (response) {
    // Any status code that lies within the range of 2xx causes this function to trigger
    // Do something with response data
    return response;
  },
  function (error) {
    // Any status codes that fall outside the range of 2xx cause this function to trigger
    // Do something with response error
    return Promise.reject(error);
  }
);
```

If you need to remove an interceptor later you can.

```js
const instance = axios.create();
const myInterceptor = instance.interceptors.request.use(function () {
  /*...*/
});
instance.interceptors.request.eject(myInterceptor);
```

You can also clear all interceptors for requests or responses.

```js
const instance = axios.create();
instance.interceptors.request.use(function () {
  /*...*/
});
instance.interceptors.request.clear(); // Removes interceptors from requests
instance.interceptors.response.use(function () {
  /*...*/
});
instance.interceptors.response.clear(); // Removes interceptors from responses
```

You can add interceptors to a custom instance of axios.

```js
const instance = axios.create();
instance.interceptors.request.use(function () {
  /*...*/
});
```

When you add request interceptors, they are presumed to be asynchronous by default. This can cause a delay
in the execution of your axios request when the main thread is blocked (a promise is created under the hood for
the interceptor and your request gets put at the bottom of the call stack). If your request interceptors are synchronous you can add a flag
to the options object that will tell axios to run the code synchronously and avoid any delays in request execution.

```js
axios.interceptors.request.use(
  function (config) {
    config.headers.test = 'I am only a header!';
    return config;
  },
  null,
  { synchronous: true }
);
```

If a synchronous request interceptor throws, Axios calls that interceptor's paired rejection handler and stops running the remaining request interceptors. A rejection handler that returns normally, including one that returns `undefined` or a fulfilled Promise, treats the error as handled: Axios dispatches the request with the last valid config, and ignores the handler's return value. To block dispatch, omit the rejection handler or throw/return a rejected Promise from it. The final error then continues through response rejection interceptors.

Use a rejected Promise when validation must prevent the request:

```js
axios.interceptors.request.use(
  function validate(config) {
    if (!config.headers.has('Authorization')) {
      throw new Error('Authorization is required');
    }
    return config;
  },
  function rejectInvalidRequest(error) {
    return Promise.reject(error);
  },
  { synchronous: true }
);
```

A logging-only rejection handler can return normally to preserve the existing request-continuation behavior:

```js
axios.interceptors.request.use(
  function prepare(config) {
    throw new Error('Optional preparation failed');
  },
  function logPreparationFailure(error) {
    console.warn(error);
    // Returning normally dispatches with the last valid config.
  },
  { synchronous: true }
);
```

If you want to execute a particular interceptor based on a runtime check,
you can add a `runWhen` function to the options object. The request interceptor will not run **if and only if** the return
of `runWhen` is `false`. Axios calls the function with the config
object (don't forget that you can bind your own arguments to it as well.) This can be handy when you have an
asynchronous request interceptor that only needs to run at certain times.

```js
function onGetCall(config) {
  return config.method === 'get';
}
axios.interceptors.request.use(
  function (config) {
    config.headers.test = 'special get headers';
    return config;
  },
  null,
  { runWhen: onGetCall }
);
```

> Note: The options parameter (with `synchronous` and `runWhen` properties) is only supported for request interceptors at the moment.

### Interceptor execution order

Request and response interceptors use different execution orders.

Request interceptors run in reverse order (LIFO: last in, first out). The last interceptor added runs first.

Response interceptors run in the order they were added (FIFO: first in, first out). The first interceptor added runs first.

Example:

```js
const instance = axios.create();

const interceptor = (id) => (base) => {
  console.log(id);
  return base;
};

instance.interceptors.request.use(interceptor('Request Interceptor 1'));
instance.interceptors.request.use(interceptor('Request Interceptor 2'));
instance.interceptors.request.use(interceptor('Request Interceptor 3'));
instance.interceptors.response.use(interceptor('Response Interceptor 1'));
instance.interceptors.response.use(interceptor('Response Interceptor 2'));
instance.interceptors.response.use(interceptor('Response Interceptor 3'));

// Console output:
// Request Interceptor 3
// Request Interceptor 2
// Request Interceptor 1
// [HTTP request is made]
// Response Interceptor 1
// Response Interceptor 2
// Response Interceptor 3
```

### Multiple interceptors

When a response is fulfilled and multiple response interceptors are registered:

- Each interceptor runs in registration order.
- Each interceptor receives the result from the previous interceptor.
- The chain returns the result from the last interceptor.
- If a fulfillment interceptor throws, Axios skips the next fulfillment interceptor and calls the next rejection interceptor.
- After the error is caught, later fulfillment interceptors run again, just like in a promise chain.

Read [the interceptor tests](./tests/browser/interceptors.browser.test.js) to see all this in code.

## Error types

Axios error messages include details that can help you debug the request.

Axios errors use this structure:
| Property | Definition |
| -------- | ---------- |
| message | A quick summary of the error message and the status it failed with. |
| name | This defines where the error originated from. For axios, it will always be an 'AxiosError'. |
| stack | Stack trace for the error. |
| config | An axios config object with specific instance configurations defined by the user from when the request was made |
| code | Axios error code. The table below lists internal Axios error codes. |
| status | HTTP response status code. See [here](https://en.wikipedia.org/wiki/List_of_HTTP_status_codes) for common HTTP response status code meanings.

These are the internal Axios error codes:

| Code                      | Definition                                                                                                                                                                                                                                                                                                                                                                                     |
| ------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| ERR_BAD_OPTION_VALUE      | Invalid value provided in axios configuration.                                                                                                                                                                                                                                                                                                                                                 |
| ERR_BAD_OPTION            | Invalid option provided in axios configuration.                                                                                                                                                                                                                                                                                                                                                |
| ERR_NOT_SUPPORT           | Feature or method not supported in the current axios environment.                                                                                                                                                                                                                                                                                                                              |
| ERR_DEPRECATED            | Deprecated feature or method used in axios.                                                                                                                                                                                                                                                                                                                                                    |
| ERR_INVALID_URL           | Invalid URL provided for axios request.                                                                                                                                                                                                                                                                                                                                                        |
| ECONNABORTED              | Typically indicates that the request has been timed out (unless `transitional.clarifyTimeoutError` is set) or aborted by the browser or its plugin.                                                                                                                                                                                                                                            |
| ERR_CANCELED              | The user explicitly canceled the request with an AbortSignal or CancelToken.                                                                                                                                                                                                                                                                                                                   |
| ETIMEDOUT                 | Request timed out after exceeding the configured Axios timeout. Set `transitional.clarifyTimeoutError` to `true`; otherwise Axios throws a generic `ECONNABORTED` error.                                                                                                                                                                                                                       |
| ERR_NETWORK               | Network-related issue. In the browser, this error can also be caused by a [CORS](https://developer.mozilla.org/ru/docs/Web/HTTP/Guides/CORS) or [Mixed Content](https://developer.mozilla.org/en-US/docs/Web/Security/Mixed_content) policy violation. The browser does not allow the JS code to clarify the real reason for the error caused by security issues, so please check the console. |
| ERR_FR_TOO_MANY_REDIRECTS | Request exceeded the configured maximum number of redirects.                                                                                                                                                                                                                                                                                                                                   |
| ERR_BAD_RESPONSE          | Response cannot be parsed properly or is in an unexpected format. Usually related to a response with `5xx` status code.                                                                                                                                                                                                                                                                        |
| ERR_BAD_REQUEST           | The request has an unexpected format or is missing required parameters. Usually related to a response with `4xx` status code.                                                                                                                                                                                                                                                                  |

## Handling errors

By default, Axios rejects responses with status codes outside the 2xx range.

```js
axios.get('/user/12345').catch(function (error) {
  if (error.response) {
    // The request was made and the server responded with a status code
    // that falls out of the range of 2xx
    console.log(error.response.data);
    console.log(error.response.status);
    console.log(error.response.headers);
  } else if (error.request) {
    // The request was made but no response was received
    // `error.request` is an instance of XMLHttpRequest in the browser and an instance of
    // http.ClientRequest in node.js
    console.log(error.request);
  } else {
    // Something happened in setting up the request that triggered an Error
    console.log('Error', error.message);
  }
  console.log(error.config);
});
```

Axios rejects an `http:` or `https:` request `url` or `baseURL` that omits `//` after the protocol. For example, `https:example.com` and `https:/example.com` reject with `AxiosError` code `ERR_INVALID_URL` instead of being silently normalized. Pass a well-formed URL such as `https://example.com`.

The error identifies the malformed URL, for example `Invalid URL "https:example.com": missing "//" after protocol`. To keep logs useful without leaking secrets, Axios reports the control-character-normalized URL with credentials, query parameter values, and fragment contents redacted; the scheme, host, path, and query parameter names remain visible.

Use `validateStatus` to override the default condition (`status >= 200 && status < 300`) and choose which HTTP status codes should reject.

```js
axios.get('/user/12345', {
  validateStatus: function (status) {
    return status < 500; // Resolve only if the status code is less than 500
  },
});
```

By default, explicit `validateStatus: undefined` keeps legacy behavior and resolves every response status because `transitional.validateStatusUndefinedResolves` defaults to `true`. Set it to `false` to make explicit `validateStatus: undefined` behave like the option was omitted, so Axios uses the configured/default validator and rejects non-2xx responses by default.

`validateStatus: null` still accepts every response status. If you disable the transitional behavior and intentionally want all statuses to resolve, use `null` or `() => true`.

```js
axios.get('/user/12345', {
  validateStatus: undefined,
  transitional: {
    validateStatusUndefinedResolves: false,
  },
});
```

Use `toJSON` to get more information about the HTTP error.

```js
axios.get('/user/12345').catch(function (error) {
  console.log(error.toJSON());
});
```

To avoid logging secrets from `error.config`, pass a `redact` array in the request config. Matching config keys are masked case-insensitively at any depth when `AxiosError#toJSON()` is called.

```js
axios
  .get('/user/12345', {
    headers: { Authorization: 'Bearer token' },
    redact: ['authorization'],
  })
  .catch(function (error) {
    console.log(error.toJSON().config.headers.Authorization); // [REDACTED ****]
  });
```

## Handling timeouts

```js
async function fetchWithTimeout() {
  try {
    const response = await axios.get('https://example.com/data', {
      timeout: 5000, // 5 seconds
      transitional: {
        // set to true if you prefer ETIMEDOUT over ECONNABORTED
        clarifyTimeoutError: false,
      },
    });

console.log('Response:', response.data);
  } catch (error) {
    if (axios.isAxiosError(error)) {
      if (error.code === 'ECONNABORTED' || error.code === 'ETIMEDOUT') {
        console.error('Request timed out. Please try again.');
        return;
      }

console.error('Axios error:', error.message);
      return;
    }

console.error('Unexpected error:', error);
  }
}
```

## Cancellation

### AbortController

Since `v0.22.0`, Axios supports AbortController:

```js
const controller = new AbortController();

axios
  .get('/foo/bar', {
    signal: controller.signal,
  })
  .then(function (response) {
    //...
  });
// cancel the request
controller.abort();
```

### CancelToken (deprecated)

You can also cancel a request using a _CancelToken_.

> The axios cancel token API is based on the withdrawn [cancellable promises proposal](https://github.com/tc39/proposal-cancelable-promises).

> This API is deprecated since v0.22.0 and should not be used in new projects.

Create a cancel token with the `CancelToken.source` factory:

```js
const CancelToken = axios.CancelToken;
const source = CancelToken.source();

axios
  .get('/user/12345', {
    cancelToken: source.token,
  })
  .catch(function (thrown) {
    if (axios.isCancel(thrown)) {
      console.log('Request canceled', thrown.message);
    } else {
      // handle error
    }
  });

axios.post(
  '/user/12345',
  {
    name: 'new name',
  },
  {
    cancelToken: source.token,
  }
);

// cancel the request (the message parameter is optional)
source.cancel('Operation canceled by the user.');
```

You can also pass an executor function to the `CancelToken` constructor:

```js
const CancelToken = axios.CancelToken;
let cancel;

axios.get('/user/12345', {
  cancelToken: new CancelToken(function executor(c) {
    // An executor function receives a cancel function as a parameter
    cancel = c;
  }),
});

// cancel the request
cancel();
```

`CancelToken` also exposes low-level helpers for legacy integrations:

```js
const source = axios.CancelToken.source();

const listener = (cancel) => {
  console.log(cancel.message);
};

source.token.subscribe(listener);

const signal = source.token.toAbortSignal();
// Pass `signal` to APIs that accept AbortSignal.

source.cancel('Operation canceled by the user.');
source.token.unsubscribe(listener);
```

Canceled requests reject with `axios.CanceledError`. The legacy `axios.Cancel` export is an alias of `axios.CanceledError`, and cancellation errors include `__CANCEL__` for `axios.isCancel` compatibility.

> Note: You can cancel several requests with the same cancel token or abort controller.
> If a cancellation token is already cancelled when an Axios request starts, Axios cancels the request immediately without making a real request.

> During the transition period, you can use both cancellation APIs, even for the same request:

```js
const controller = new AbortController();
const source = axios.CancelToken.source();

axios.get('/user/12345', {
  cancelToken: source.token,
  signal: controller.signal,
});

controller.abort();
source.cancel('Operation canceled by the user.');
```

## Using `application/x-www-form-urlencoded` format

### URLSearchParams

By default, axios serializes JavaScript objects to `JSON`. To send data as [`application/x-www-form-urlencoded`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST), use the [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams) API. It works in most browsers and in [Node](https://nodejs.org/api/url.html#url_class_urlsearchparams) v10 and later.

```js
const params = new URLSearchParams({ foo: 'bar' });
params.append('extraparam', 'value');
axios.post('/foo', params);
```

### Query string (older browsers)

For very old browsers, use a [polyfill](https://github.com/WebReflection/url-search-params) and make sure it patches the global environment.

Alternatively, you can encode data using the [`qs`](https://github.com/ljharb/qs) library:

```js
const qs = require('qs');
axios.post('/foo', qs.stringify({ bar: 123 }));
```

With ES modules:

```js
import qs from 'qs';
const data = { bar: 123 };
const options = {
  method: 'POST',
  headers: { 'content-type': 'application/x-www-form-urlencoded' },
  data: qs.stringify(data),
  url,
};
axios(options);
```

### Older Node.js versions

For older Node.js engines, use the [`querystring`](https://nodejs.org/api/querystring.html) module:

```js
const querystring = require('querystring');
axios.post('https://something.com/', querystring.stringify({ foo: 'bar' }));
```

You can also use the [`qs`](https://github.com/ljharb/qs) library.

> Note: The `qs` library is preferable if you need to stringify nested objects, as the `querystring` method has [known issues](https://github.com/nodejs/node-v0.x-archive/issues/1665) with that use case.

### Automatic serialization to URLSearchParams

Axios automatically serializes the data object to urlencoded format if the content-type header is set to "application/x-www-form-urlencoded".

```js
const data = {
  x: 1,
  arr: [1, 2, 3],
  arr2: [1, [2], 3],
  users: [
    { name: 'Peter', surname: 'Griffin' },
    { name: 'Thomas', surname: 'Anderson' },
  ],
};

await axios.postForm('https://postman-echo.com/post', data, {
  headers: { 'content-type': 'application/x-www-form-urlencoded' },
});
```

The server receives these fields:

```js
  {
    x: '1',
    'arr[]': [ '1', '2', '3' ],
    'arr2[0]': '1',
    'arr2[1][0]': '2',
    'arr2[2]': '3',
    'arr3[]': [ '1', '2', '3' ],
    'users[0][name]': 'Peter',
    'users[0][surname]': 'griffin',
    'users[1][name]': 'Thomas',
    'users[1][surname]': 'Anderson'
  }
```

If your backend body parser, such as `body-parser` for `express.js`, supports nested object decoding, the server receives the same object structure:

```js
const app = express();

app.use(bodyParser.urlencoded({ extended: true })); // support encoded bodies

app.post('/', function (req, res, next) {
  // echo body as JSON
  res.send(JSON.stringify(req.body));
});

server = app.listen(3000);
```

## Using `multipart/form-data` format

### FormData

To send data as `multipart/form-data`, pass a FormData instance as the payload.
You do not need to set the `Content-Type` header. Axios detects it from the payload type.
For browser, web worker, and React Native `FormData`, leave `Content-Type` unset so the runtime can add the multipart boundary.

```js
const formData = new FormData();
formData.append('foo', 'bar');

axios.post('https://httpbin.org/post', formData);
```

In node.js, use the [`form-data`](https://github.com/form-data/form-data) library:

```js
const FormData = require('form-data');

const form = new FormData();
form.append('my_field', 'my value');
form.append('my_buffer', Buffer.alloc(10));
form.append('my_file', fs.createReadStream('/foo/bar.jpg'));

axios.post('https://example.com', form);
```

In node.js, when a `FormData` object provides `getHeaders()`, axios copies all returned headers by default for v1 compatibility. If the `FormData` object is custom or not fully trusted, set `formDataHeaderPolicy: 'content-only'` to copy only `Content-Type` and `Content-Length`, and set any other request headers explicitly with the request `headers` config.

### Automatic serialization to FormData

Since `v0.27.0`, Axios can serialize an object to FormData if the request `Content-Type`
header is set to `multipart/form-data`.

This request submits data as FormData in browsers and Node.js:

```js
import axios from 'axios';

axios
  .post(
    'https://httpbin.org/post',
    { x: 1 },
    {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    }
  )
  .then(({ data }) => console.log(data));
```

The Node.js build uses the [`form-data`](https://github.com/form-data/form-data) polyfill by default.

You can override the FormData class with the `env.FormData` config option, but most applications do not need this:

```js
const axios = require('axios');
var FormData = require('form-data');

axios
  .post(
    'https://httpbin.org/post',
    { x: 1, buf: Buffer.alloc(10) },
    {
      headers: {
        'Content-Type': 'multipart/form-data',
      },
    }
  )
  .then(({ data }) => console.log(data));
```

The Axios FormData serializer supports these special endings:

- `{}` - serialize the value with JSON.stringify
- `[]` - unwrap the array-like object as separate fields with the same key

> Note: Arrays and FileList objects are unwrapped by default.

FormData serializer supports additional options via `config.formSerializer: object` property to handle rare cases:

- `visitor: Function` - user-defined visitor function that Axios calls recursively to serialize the data object
  to a `FormData` object by following custom rules.

- `dots: boolean = false` - use dot notation instead of brackets to serialize arrays and objects;

- `metaTokens: boolean = true` - add the special ending (e.g `user{}: '{"name": "John"}'`) in the FormData key.
  A backend body parser can use this meta-information to parse the value as JSON.

- `indexes: null|false|true = false` - controls how Axios adds indexes to unwrapped keys of `flat` array-like objects.
  - `null` - don't add brackets (`arr: 1`, `arr: 2`, `arr: 3`)
  - `false`(default) - add empty brackets (`arr[]: 1`, `arr[]: 2`, `arr[]: 3`)
  - `true` - add brackets with indexes (`arr[0]: 1`, `arr[1]: 2`, `arr[2]: 3`)
- `maxDepth: number = 100` - maximum object nesting depth the serializer will recurse into. If the
  input object exceeds this depth, an `AxiosError` with `code: 'ERR_FORM_DATA_DEPTH_EXCEEDED'` is
  thrown instead of overflowing the call stack. This protects server applications from DoS
  attacks via deeply nested payloads. Set to `Infinity` to disable the limit and restore pre-fix behaviour.
- `Blob: typeof Blob` - Blob constructor used when converting ArrayBuffer-like values for spec-compliant
  `FormData`. Override it only for runtimes that provide a compatible `Blob` constructor under a
  different binding.

```js
// Raise the limit for a schema that genuinely nests deeper than 100 levels:
axios.postForm('/api', data, { formSerializer: { maxDepth: 200 } });

// Same protection applies to params serialization:
axios.get('/api', { params: data, paramsSerializer: { maxDepth: 200 } });
```

Given this object:

```js
const obj = {
  x: 1,
  arr: [1, 2, 3],
  arr2: [1, [2], 3],
  users: [
    { name: 'Peter', surname: 'Griffin' },
    { name: 'Thomas', surname: 'Anderson' },
  ],
  'obj2{}': [{ x: 1 }],
};
```

The Axios serializer appends these fields:

```js
const formData = new FormData();
formData.append('x', '1');
formData.append('arr[]', '1');
formData.append('arr[]', '2');
formData.append('arr[]', '3');
formData.append('arr2[0]', '1');
formData.append('arr2[1][0]', '2');
formData.append('arr2[2]', '3');
formData.append('users[0][name]', 'Peter');
formData.append('users[0][surname]', 'Griffin');
formData.append('users[1][name]', 'Thomas');
formData.append('users[1][surname]', 'Anderson');
formData.append('obj2{}', '[{"x":1}]');
```

### Converting FormData to JSON

`axios.formToJSON()` converts `FormData` field names that use dot or bracket notation into nested objects and arrays. Only `.`, `[`, and `]` are structural separators. Other characters, including `-`, spaces, `+`, `*`, and `&`, remain part of the literal key.

```js
const form = new FormData();
form.append('user-name', 'johndoe');
form.append('user.name', 'john');

console.log(axios.formToJSON(form));
// {
//   'user-name': 'johndoe',
//   user: { name: 'john' }
// }
```

`user[name]` also creates `{ user: { name: ... } }`, while `items[]` creates an array.

Axios supports `postForm`, `putForm`, and `patchForm` as shortcuts for the matching HTTP methods with the `Content-Type` header preset to `multipart/form-data`.

## Posting files

Submit a single file:

```js
await axios.postForm('https://httpbin.org/post', {
  myVar: 'foo',
  file: document.querySelector('#fileInput').files[0],
});
```

or multiple files as `multipart/form-data`:

```js
await axios.postForm('https://httpbin.org/post', {
  'files[]': document.querySelector('#fileInput').files,
});
```

`FileList` object can be passed directly:

```js
await axios.postForm('https://httpbin.org/post', document.querySelector('#fileInput').files);
```

Axios sends all files with the same field name: `files[]`.

## HTML form posting (browser)

Pass an HTML Form element as a payload to submit it as `multipart/form-data` content.

```js
await axios.postForm('https://httpbin.org/post', document.querySelector('#htmlForm'));
```

`FormData` and `HTMLForm` objects can also be posted as `JSON` by explicitly setting the `Content-Type` header to `application/json`:

```js
await axios.post('https://httpbin.org/post', document.querySelector('#htmlForm'), {
  headers: {
    'Content-Type': 'application/json',
  },
});
```

For example, the Form

```html
<form id="form">
  <input type="text" name="foo" value="1" />
  <input type="text" name="deep.prop" value="2" />
  <input type="text" name="deep prop spaced" value="3" />
  <input type="text" name="baz" value="4" />
  <input type="text" name="baz" value="5" />

<select name="user.age">
    <option value="value1">Value 1</option>
    <option value="value2" selected>Value 2</option>
    <option value="value3">Value 3</option>
  </select>

<input type="submit" value="Save" />
</form>
```

submits this JSON object:

```js
{
  "foo": "1",
  "deep": {
    "prop": "2"
  },
  "deep prop spaced": "3",
  "baz": [
    "4",
    "5"
  ],
  "user": {
    "age": "value2"
  }
}
```

Only dot and bracket notation create nested paths when a form is converted to JSON. Spaces and other punctuation remain part of literal field names.

Sending `Blobs`/`Files` as JSON (`base64`) is not currently supported.

## Progress capturing

Axios can capture request upload and download progress in browsers and Node.js.
Progress events are limited to `3` times per second.

```js
await axios.post(url, data, {
  onUploadProgress: function (axiosProgressEvent) {
    /*{
      loaded: number;
      total?: number;
      progress?: number; // in range [0..1]
      bytes: number; // how many bytes have been transferred since the last trigger (delta)
      estimated?: number; // estimated time in seconds
      rate?: number; // upload speed in bytes
      upload: true; // upload sign
    }*/
  },

onDownloadProgress: function (axiosProgressEvent) {
    /*{
      loaded: number;
      total?: number;
      progress?: number;
      bytes: number;
      estimated?: number;
      rate?: number; // download speed in bytes
      download: true; // download sign
    }*/
  },
});
```

You can also track stream upload/download progress in node.js:

```js
const { data } = await axios.post(SERVER_URL, readableStream, {
  onUploadProgress: ({ progress }) => {
    console.log((progress * 100).toFixed(2));
  },

headers: {
    'Content-Length': contentLength,
  },

maxRedirects: 0, // avoid buffering the entire stream
});
```

> Note:
> Capturing FormData upload progress is not currently supported in node.js environments.

> Warning:
> Set `maxRedirects: 0` when uploading streams in node.js.
> The follow-redirects package buffers the entire stream in RAM and does not follow the "backpressure" algorithm.

## Rate limiting

Download and upload rate limits can only be set for the http adapter (node.js):

```js
const { data } = await axios.post(LOCAL_SERVER_URL, myBuffer, {
  onUploadProgress: ({ progress, rate }) => {
    console.log(`Upload [${(progress * 100).toFixed(2)}%]: ${(rate / 1024).toFixed(2)}KB/s`);
  },

maxRate: [100 * 1024], // 100KB/s limit
});
```

## AxiosHeaders

Axios includes an `AxiosHeaders` class for working with headers through a Map-like API.
HTTP header names are case-insensitive, but Axios keeps the original header case for style and for servers that incorrectly depend on case.
Directly manipulating the headers object still works, but it is deprecated.

### Working with headers

An `AxiosHeaders` instance can contain several internal value types that control setting and merging.
Axios gets the final headers object with string values by calling `toJSON`.

> Note: By JSON here we mean an object consisting only of string values intended to be sent over the network.

The header value can be one of the following types:

- `string` - normal string value sent to the server
- `null` - skip header when rendering to JSON
- `false` - skip header when rendering to JSON. Also indicates that the `set` method must be called with `rewrite` set to `true`
  to overwrite this value (Axios uses this internally to allow users to opt out of installing certain headers like `User-Agent` or `Content-Type`)
- `undefined` - value is not set

> Note: The header value is considered set if it is not equal to undefined.

The headers object is always initialized inside interceptors and transformers:

```ts
axios.interceptors.request.use((request: InternalAxiosRequestConfig) => {
  request.headers.set('My-header', 'value');

request.headers.set({
    'My-set-header1': 'my-set-value1',
    'My-set-header2': 'my-set-value2',
  });

request.headers.set('User-Agent', false); // prevent Axios from setting this header later

request.headers.setContentType('text/plain');

request.headers['My-set-header2'] = 'newValue'; // direct access is deprecated

return request;
});
```

You can iterate over an `AxiosHeaders` instance using a `for...of` statement:

```js
const headers = new AxiosHeaders({
  foo: '1',
  bar: '2',
  baz: '3',
});

for (const [header, value] of headers) {
  console.log(header, value);
}

// foo 1
// bar 2
// baz 3
```

### Preserving a specific header case

Header names are case-insensitive, but `AxiosHeaders` keeps the case of the first matching key it sees.
If you need a specific case for non-standard case-sensitive servers, define a case preset with `undefined` and then set the value later:

```js
const api = axios.create();

api.defaults.headers.common = {
  'content-type': undefined,
  accept: undefined,
};

await api.put(url, data, {
  headers: {
    'Content-Type': 'application/octet-stream',
    Accept: 'application/json',
  },
});
```

You can also compose the same behavior with `AxiosHeaders.concat`:

```js
const headers = axios.AxiosHeaders.concat(
  { 'content-type': undefined },
  { 'Content-Type': 'application/octet-stream' }
);

await axios.put(url, data, { headers });
```

### new AxiosHeaders(headers?)

Constructs a new `AxiosHeaders` instance.

```
constructor(headers?: RawAxiosHeaders | AxiosHeaders | string);
```

If the headers object is a string, Axios parses it as raw HTTP headers.

```js
const headers = new AxiosHeaders(`
Host: www.bing.com
User-Agent: curl/7.54.0
Accept: */*`);

console.log(headers);

// Object [AxiosHeaders] {
//   host: 'www.bing.com',
//   'user-agent': 'curl/7.54.0',
//   accept: '*/*'
// }
```

### AxiosHeaders#set

```ts
set(headerName, value: Axios, rewrite?: boolean);
set(headerName, value, rewrite?: (this: AxiosHeaders, value: string, name: string, headers: RawAxiosHeaders) => boolean);
set(headers?: RawAxiosHeaders | AxiosHeaders | string, rewrite?: boolean);
set(headers?: Iterable<[string, AxiosHeaderValue]>, rewrite?: boolean);
```

The `rewrite` argument controls the overwriting behavior:

- `false` - do not overwrite if the header's value is set (is not `undefined`)
- `undefined` (default) - overwrite the header unless its value is set to `false`
- `true` - rewrite anyway

The option can also accept a user-defined function that determines whether to overwrite the value.

Empty or whitespace-only header names are ignored.

Iterable key/value pairs, such as a `Map`, are accepted:

```js
const headers = new AxiosHeaders();

headers.set(
  new Map([
    ['X-Trace-Id', 'abc123'],
    ['Accept', 'application/json'],
  ])
);
```

Returns `this`.

### AxiosHeaders#get(header)

```
  get(headerName: string, parser: typeof AxiosHeaders.parseParameters): AxiosHeaderParameters;
  get(headerName: string, parser: RegExp): RegExpExecArray | null;
  get(headerName: string, matcher?: true | AxiosHeaderParser): AxiosHeaderValue;
```

Returns the internal value of the header. It can take an extra argument to parse the header's value with `RegExp.exec`,
matcher function or internal key-value parser.

```ts
const headers = new AxiosHeaders({
  'Content-Type': 'multipart/form-data; boundary=Asrf456BGe4h',
});

console.log(headers.get('Content-Type'));
// multipart/form-data; boundary=Asrf456BGe4h

console.log(headers.get('Content-Type', true)); // parse key-value pairs from a string separated with \s,;= delimiters:
// [Object: null prototype] {
//   'multipart/form-data': undefined,
//    boundary: 'Asrf456BGe4h'
// }

const quotedHeaders = new AxiosHeaders({
  'Content-Type': 'multipart/form-data; boundary="a,b"',
});

console.log({
  ...quotedHeaders.get('Content-Type', AxiosHeaders.parseParameters),
});
// { boundary: 'a,b' }

console.log(
  headers.get('Content-Type', (value, name, headers) => {
    return String(value).replace(/a/g, 'ZZZ');
  })
);
// multipZZZrt/form-dZZZtZZZ; boundZZZry=Asrf456BGe4h

console.log(headers.get('Content-Type', /boundary=(\w+)/)?.[0]);
// boundary=Asrf456BGe4h
```

`AxiosHeaders.parseParameters` is the opt-in parser for normalized HTTP parameter values. It returns a null-prototype map, matches parameter names case-insensitively, removes quoted-string delimiters, decodes escaped quotes and backslashes, preserves commas and semicolons inside quoted values, and removes only HTTP optional whitespace around unquoted values. It omits the unsafe keys `__proto__`, `constructor`, and `prototype`.

Passing `true` remains the legacy tokenizer and keeps its existing output for backward compatibility.

Returns the value of the header.

### AxiosHeaders#has(header, matcher?)

```
has(header: string, matcher?: AxiosHeaderMatcher): boolean;
```

Returns `true` if the header is set (has no `undefined` value).

### AxiosHeaders#delete(header, matcher?)

```
delete(header: string | string[], matcher?: AxiosHeaderMatcher): boolean;
```

Returns `true` if at least one header has been removed.

### AxiosHeaders#clear(matcher?)

```
clear(matcher?: AxiosHeaderMatcher): boolean;
```

Removes all headers.
Unlike the `delete` method matcher, this optional matcher matches the header name rather than the value.

```ts
const headers = new AxiosHeaders({
  foo: '1',
  'x-foo': '2',
  'x-bar': '3',
});

console.log(headers.clear(/^x-/)); // true

console.log(headers.toJSON()); // [Object: null prototype] { foo: '1' }
```

Returns `true` if at least one header has been cleared.

### AxiosHeaders#normalize(format);

If the headers object was changed directly, it can have duplicates with the same name but in different cases.
This method normalizes the headers object by combining duplicate keys into one.
Axios uses this method internally after calling each interceptor.
Set `format` to true for converting header names to lowercase and capitalizing the initial letters (`cOntEnt-type` => `Content-Type`)

```js
const headers = new AxiosHeaders({
  foo: '1',
});

headers.Foo = '2';
headers.FOO = '3';

console.log(headers.toJSON()); // [Object: null prototype] { foo: '1', Foo: '2', FOO: '3' }
console.log(headers.normalize().toJSON()); // [Object: null prototype] { foo: '3' }
console.log(headers.normalize(true).toJSON()); // [Object: null prototype] { Foo: '3' }
```

Returns `this`.

### AxiosHeaders#concat(...targets)

```
concat(...targets: Array<AxiosHeaders | RawAxiosHeaders | string | undefined | null>): AxiosHeaders;
```

Merges the instance with targets into a new `AxiosHeaders` instance. If the target is a string, Axios parses it as raw HTTP headers.

Returns a new `AxiosHeaders` instance.

### AxiosHeaders#toJSON(asStrings?)

```
toJSON(asStrings: true): Record<string, string>;
toJSON(asStrings?: false): Record<string, string | string[]>;
```

Resolves all internal header values into a new null prototype object.
Set `asStrings` to true to resolve arrays as a string containing all elements, separated by commas.

### AxiosHeaders#toString()

```
toString(): string;
```

Returns the headers as a CRLF-free HTTP header block, one `name: value` pair per line.

### AxiosHeaders.from(thing?)

```
from(thing?: AxiosHeaders | RawAxiosHeaders | string): AxiosHeaders;
```

Returns a new `AxiosHeaders` instance created from the raw headers passed in,
or returns the given headers object if it's already an `AxiosHeaders` instance.

### AxiosHeaders.concat(...targets)

```
concat(...targets: Array<AxiosHeaders | RawAxiosHeaders | string | undefined | null>): AxiosHeaders;
```

Returns a new `AxiosHeaders` instance created by merging the target objects.

### Shortcuts

The following shortcuts are available:

- `setContentType`, `getContentType`, `hasContentType`

- `setContentLength`, `getContentLength`, `hasContentLength`

- `setAccept`, `getAccept`, `hasAccept`

- `setUserAgent`, `getUserAgent`, `hasUserAgent`

- `setContentEncoding`, `getContentEncoding`, `hasContentEncoding`

## Fetch adapter

Axios introduced the fetch adapter in `v1.7.0`. By default, Axios uses it when the `xhr` and `http` adapters are not available in the build or not supported by the environment.
To use it by default, select it explicitly:

```js
const { data } = axios.get(url, {
  adapter: 'fetch', // by default ['xhr', 'http', 'fetch']
});
```

You can create a separate instance for this:

```js
const fetchAxios = axios.create({
  adapter: 'fetch',
});

const { data } = fetchAxios.get(url);
```

The adapter supports the same features as the `xhr` adapter, including upload and download progress capturing.
It also supports response types such as `stream` and `formdata` when the environment supports them.

When `auth` is omitted, the fetch adapter can read HTTP Basic auth credentials from the request URL, for example `https://user:pass@example.com`. Percent-encoded URL credentials are decoded before the `Authorization` header is generated, and `auth` takes precedence over URL-embedded credentials.

### Custom fetch

Since `v1.12.0`, you can configure the fetch adapter to use a custom fetch API instead of environment globals.
Pass a custom `fetch` function, `Request`, and `Response` constructors through `env` config.
This helps in custom environments and app frameworks.

When using a custom fetch, you may also need to set custom `Request` and `Response` constructors. If you do not set them, Axios uses the global objects.
If your custom fetch API does not provide these objects and the globals are incompatible with it, pass `null` to disable them inside the fetch adapter.

> Note: Setting `Request` and `Response` to `null` prevents the fetch adapter from capturing upload and download progress.

Basic example:

```js
import customFetchFunction from 'customFetchModule';

const instance = axios.create({
  adapter: 'fetch',
  onDownloadProgress(e) {
    console.log('downloadProgress', e);
  },
  env: {
    fetch: customFetchFunction,
    Request: null, // undefined -> use the global constructor
    Response: null,
  },
});
```

#### Using with Tauri

A minimal example of setting up Axios for use in a [Tauri](https://tauri.app/plugin/http-client/) app with a platform fetch function that ignores CORS policy for requests.

```js
import { fetch } from '@tauri-apps/plugin-http';
import axios from 'axios';

const instance = axios.create({
  adapter: 'fetch',
  onDownloadProgress(e) {
    console.log('downloadProgress', e);
  },
  env: {
    fetch,
  },
});

const { data } = await instance.get('https://google.com');
```

#### Using with SvelteKit

[SvelteKit](https://svelte.dev/docs/kit/web-standards#Fetch-APIs) uses a custom fetch function for server rendering in `load` functions. It also uses relative paths, which are incompatible with the standard URL API. Configure Axios to use SvelteKit's custom fetch API:

```js
export async function load({ fetch }) {
  const { data: post } = await axios.get('https://jsonplaceholder.typicode.com/posts/1', {
    adapter: 'fetch',
    env: {
      fetch,
      Request: null,
      Response: null,
    },
  });

return { post };
}
```

#### HTTP/2 support

Axios supports HTTP/2 through the Node.js `http` adapter, introduced in v1.13.0.

Support depends on the runtime environment. Axios relies on Node.js APIs, so HTTP/2 works in supported Node.js versions but may not work in other environments such as Bun or Deno.

Options like `httpVersion` and `http2Options` are adapter-specific and may not behave the same way in every environment.

Note: HTTP/2 redirects are currently not supported by the HTTP/2 adapter.

```js
const form = new FormData();

form.append('foo', '123');

const { data, headers, status } = await axios.post('https://httpbin.org/post', form, {
  onUploadProgress(e) {
    console.log('upload progress', e);
  },
  onDownloadProgress(e) {
    console.log('download progress', e);
  },
  responseType: 'arraybuffer',
});
```

## Semver

Axios follows [semver](https://semver.org/) since `v1.0.0`.

## Promises

axios depends on a native ES6 Promise implementation to be [supported](https://caniuse.com/promises).
If your environment doesn't support ES6 Promises, you can [polyfill](https://github.com/jakearchibald/es6-promise).

## TypeScript

axios includes [TypeScript](https://typescriptlang.org) definitions and a type guard for axios errors.

```typescript
let user: User = null;
try {
  const { data } = await axios.get('/user?ID=12345');
  user = data.userDetails;
} catch (error) {
  if (axios.isAxiosError(error)) {
    handleAxiosError(error);
  } else {
    handleUnexpectedError(error);
  }
}
```

Use `axios.isCancel<T>()` to narrow cancellation errors to `CanceledError<T>`:

```typescript
const controller = new AbortController();

try {
  await axios.get<User>('/user?ID=12345', { signal: controller.signal });
} catch (error) {
  if (axios.isCancel<User>(error)) {
    handleCancellation(error);
  }
}
```

### Typing request data and query params

`AxiosRequestConfig<D = any, P = any>` uses `D` for the request body and `P` for query parameters. The params serializer receives the same `P`, and both types are preserved on the default response config:

```typescript
import axios, {
  type AxiosPromise,
  type AxiosRequestConfig,
  type InternalAxiosRequestConfig,
} from 'axios';

interface RequestBody {
  includeArchived: boolean;
}

interface SearchParams {
  query: string;
  page?: number;
}

interface SearchResponse {
  results: string[];
}

const config: AxiosRequestConfig<RequestBody, SearchParams> = {
  data: { includeArchived: false },
  params: { query: 'axios', page: 1 },
  paramsSerializer: (params) => `${params.query}:${params.page ?? 1}`,
};

const response = await axios.get('/search', config);
response.config.data;   // RequestBody | undefined
response.config.params; // SearchParams | undefined

const invalidConfig: AxiosRequestConfig<RequestBody, SearchParams> = {
  // @ts-expect-error `query` must be a string
  params: { query: 123 },
};

const adapter = (
  adapterConfig: InternalAxiosRequestConfig<RequestBody, SearchParams>
): AxiosPromise<SearchResponse, RequestBody, SearchParams> =>
  Promise.resolve({
    data: { results: [] },
    status: 200,
    statusText: 'OK',
    headers: {},
    config: adapterConfig,
  });
```

The request methods place `P` last—`<T, R, D, P>`—so the existing response data (`T`), custom response (`R`), and request data (`D`) positions do not change. Explicit custom response types still determine the resolved value. `RawAxiosRequestConfig`, `InternalAxiosRequestConfig`, defaults, `AxiosResponse`, `AxiosPromise<T, D, P>`, `AxiosError`, `CanceledError`, callable instances, adapters, and `mergeConfig()` also carry `P`. The default is `any` for backward compatibility.

Use all three public error generics when cancellation narrowing must retain the response, request body, and params types:

```typescript
declare const error: unknown;

if (axios.isCancel<SearchResponse, RequestBody, SearchParams>(error)) {
  error.config?.data;   // RequestBody | undefined
  error.config?.params; // SearchParams | undefined
}
```

### Symbol-keyed custom request config

Own enumerable symbol properties survive config merging, so module-augmented options can reach request interceptors and adapters:

```typescript
import axios from 'axios';

export const someFlag: unique symbol = Symbol(
  'some flag used in request interceptor'
);

declare module 'axios' {
  interface AxiosRequestConfig<D = any, P = any> {
    [someFlag]?: boolean;
  }
}

axios.interceptors.request.use((config) => {
  if (config[someFlag]) {
    config.headers.set('X-Some-Flag', 'enabled');
  }
  return config;
});

await axios.get('/users', { [someFlag]: true });
```

Only own enumerable symbol properties are copied; inherited and non-enumerable symbol properties are not.

Because axios publishes an ESM default export and a CJS `module.exports`, TypeScript has a few caveats.
The recommended setting is `"moduleResolution": "node16"`, which is implied by `"module": "node16"`. This requires TypeScript 4.7 or greater.
If you use ESM, your settings should be fine.
If you compile TypeScript to CJS and can't use `"moduleResolution": "node 16"`, enable `esModuleInterop`.
If you use TypeScript to type check CJS JavaScript code, your only option is to use `"moduleResolution": "node16"`.

You can also create a custom instance with typed interceptors:

```typescript
import axios, { AxiosInstance, InternalAxiosRequestConfig } from 'axios';

const apiClient: AxiosInstance = axios.create({
  baseURL: 'https://api.example.com',
  timeout: 10000,
});

apiClient.interceptors.request.use((config: InternalAxiosRequestConfig) => {
  // Add auth token
  return config;
});
```

## Online one-click setup

You can use Gitpod, a free online IDE for open source projects, to contribute or run the examples online.

[![Open in Gitpod](https://gitpod.io/button/open-in-gitpod.svg)](https://gitpod.io/#https://github.com/axios/axios/blob/main/examples/server.js)

## Contributing

### Local setup

As a supply-chain hardening measure, this repository ships a project-level `.npmrc` that sets `ignore-scripts=true`. This blocks npm lifecycle scripts (`preinstall`, `install`, `postinstall`, `prepare`) from any direct or transitive dependency when you run `npm install` or `npm ci` inside the repo. See [THREATMODEL.md](./THREATMODEL.md) (threat T-S2) for the rationale.

One consequence: the repository's own `prepare` hook (which installs Husky's git hooks) will **not** run automatically. After your first install, enable the git hooks manually:

```bash
npm ci
npm rebuild husky && npx husky
```

Run those two commands once per fresh checkout. You do **not** need to re-run them after every subsequent `npm install`.

Do not remove `ignore-scripts=true` from `.npmrc` to "fix" this. That reopens the lifecycle-script attack surface for every other package in the tree. All CI workflows already invoke npm with `--ignore-scripts`, so local behaviour matches CI.

## Resources

- [Changelog](https://github.com/axios/axios/blob/v1.x/CHANGELOG.md)
- [Ecosystem](https://github.com/axios/axios/blob/v1.x/ECOSYSTEM.md)
- [Contributing Guide](https://github.com/axios/axios/blob/v1.x/CONTRIBUTING.md)
- [Code of Conduct](https://github.com/axios/axios/blob/v1.x/CODE_OF_CONDUCT.md)

## Credits

axios is heavily inspired by the [$http service](https://docs.angularjs.org/api/ng/service/$http) in [AngularJS](https://angularjs.org/). It provides a standalone `$http`-like service for use outside AngularJS.

## License

[![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://raw.githubusercontent.com/axios/axios/v1.x/LICENSE)

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