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Koa middleware for validating JSON Web Tokens

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# [**koa-jwt**](https://github.com/koajs/jwt)

> Koa middleware for validating JSON Web Tokens.

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## Table of Contents

- [koa-jwt](#koa-jwt)
  - [Table of Contents](#table-of-contents)
  - [Introduction](#introduction)
  - [Install](#install)
  - [Usage](#usage)
    - [Retrieving the token](#retrieving-the-token)
    - [Passing the secret](#passing-the-secret)
    - [Checking if the token is revoked](#checking-if-the-token-is-revoked)
  - [Example](#example)
  - [Token Verification Exceptions](#token-verification-exceptions)
  - [Related Modules](#related-modules)
  - [Tests](#tests)
  - [Author](#author)
  - [Credits](#credits)
  - [Contributors](#contributors)
  - [License](#license)

## Introduction

This module lets you authenticate HTTP requests using JSON Web Tokens
in your [Koa](http://koajs.com/) (node.js) applications.

See [this article](https://github.com/dentarg/blog/blob/master/_posts/2014-01-07-angularjs-authentication-with-cookies-vs-token.markdown)
for a good introduction.

* If you are using `koa` version 2+, and you have a version of node < 7.6, install `koa-jwt@2`.
* `koa-jwt` version 3+ on the [master](https://github.com/koajs/jwt) branch uses `async` / `await` and hence requires node >= 7.6.
* If you are using `koa` version 1, you need to install `koa-jwt@1` from npm. This is the code on the [koa-v1](https://github.com/koajs/jwt/tree/koa-v1) branch.

## Install

```bash
npm install koa-jwt
```

## Usage

The JWT authentication middleware authenticates callers using a JWT
token. If the token is valid, `ctx.state.user` (by default) will be set
with the JSON object decoded to be used by later middleware for
authorization and access control.

### Retrieving the token

The token is normally provided in a HTTP header (`Authorization`), but it
can also be provided in a cookie by setting the `opts.cookie` option
to the name of the cookie that contains the token. Custom token retrieval
can also be done through the `opts.getToken` option. The provided function
should match the following interface:

```js
/**
 * Your custom token resolver
 * @this The ctx object passed to the middleware
 *
 * @param  {Object}      opts The middleware's options
 * @return {String|null}      The resolved token or null if not found
 */
```

opts, the middleware's options:

* getToken
* secret
* key
* isRevoked
* passthrough
* cookie
* audience
* issuer
* debug

The resolution order for the token is the following. The first non-empty token resolved will be the one that is verified.

* `opts.getToken` function.
* check the cookies (if `opts.cookie` is set).
* check the Authorization header for a bearer token.

### Passing the secret

One can provide a single secret, or array of secrets in `opts.secret`. An
alternative is to have an earlier middleware set `ctx.state.secret`,
typically per request. If this property exists, it will be used instead
of `opts.secret`.

### Checking if the token is revoked

You can provide a async function to jwt for it check the token is revoked.
Only you set the function in `opts.isRevoked`. The provided function should
match the following interface:

```js
/**
 * Your custom isRevoked resolver
 *
 * @param  {object}   ctx            The ctx object passed to the middleware
 * @param  {object}   decodedToken   Content of the token
 * @param  {object}   token          token The token
 * @return {Promise}                 If the token is not revoked, the promise must resolve with false, otherwise (the promise resolve with true or error) the token is revoked
 */
```

## Example

```js
var Koa = require('koa');
var jwt = require('koa-jwt');

var app = new Koa();

// Custom 401 handling if you don't want to expose koa-jwt errors to users
app.use(function(ctx, next){
  return next().catch((err) => {
    if (401 == err.status) {
      ctx.status = 401;
      ctx.body = 'Protected resource, use Authorization header to get access\n';
    } else {
      throw err;
    }
  });
});

// Unprotected middleware
app.use(function(ctx, next){
  if (ctx.url.match(/^\/public/)) {
    ctx.body = 'unprotected\n';
  } else {
    return next();
  }
});

// Middleware below this line is only reached if JWT token is valid
app.use(jwt({ secret: 'shared-secret' }));

// Protected middleware
app.use(function(ctx){
  if (ctx.url.match(/^\/api/)) {
    ctx.body = 'protected\n';
  }
});

app.listen(3000);
```

Alternatively you can conditionally run the `jwt` middleware under certain conditions:

```js
var Koa = require('koa');
var jwt = require('koa-jwt');

var app = new Koa();

// Middleware below this line is only reached if JWT token is valid
// unless the URL starts with '/public'
app.use(jwt({ secret: 'shared-secret' }).unless({ path: [/^\/public/] }));

// Unprotected middleware
app.use(function(ctx, next){
  if (ctx.url.match(/^\/public/)) {
    ctx.body = 'unprotected\n';
  } else {
    return next();
  }
});

// Protected middleware
app.use(function(ctx){
  if (ctx.url.match(/^\/api/)) {
    ctx.body = 'protected\n';
  }
});

app.listen(3000);
```

For more information on `unless` exceptions, check [koa-unless](https://github.com/Foxandxss/koa-unless).

You can also add the `passthrough` option to always yield next,
even if no valid Authorization header was found:

```js
app.use(jwt({ secret: 'shared-secret', passthrough: true }));
```

This lets downstream middleware make decisions based on whether `ctx.state.user` is set. You can still handle errors using  `ctx.state.jwtOriginalError`.

If you prefer to use another ctx key for the decoded data, just pass in `key`, like so:

```js
app.use(jwt({ secret: 'shared-secret', key: 'jwtdata' }));
```

This makes the decoded data available as `ctx.state.jwtdata`.

You can specify audience and/or issuer as well:

```js
app.use(jwt({ secret:   'shared-secret',
              audience: 'http://myapi/protected',
              issuer:   'http://issuer' }));
```

You can specify an array of secrets.

The token will be considered valid if it validates successfully against _any_ of the supplied secrets.
This allows for rolling shared secrets, for example:

```js
app.use(jwt({ secret: ['old-shared-secret', 'new-shared-secret'] }));
```

## Token Verification Exceptions

If the JWT has an expiration (`exp`), it will be checked.

All error codes for token verification can be found at: [https://github.com/auth0/node-jsonwebtoken#errors--codes](https://github.com/auth0/node-jsonwebtoken#errors--codes).

Notifying a client of error codes (e.g token expiration) can be achieved by sending the `err.originalError.message` error code to the client. If passthrough is enabled use `ctx.state.jwtOriginalError`.

```js
// Custom 401 handling (first middleware)
app.use(function (ctx, next) {
  return next().catch((err) => {
    if (err.status === 401) {
      ctx.status = 401;
      ctx.body = {
        error: err.originalError ? err.originalError.message : err.message
      };
    } else {
      throw err;
    }
  });
});
```

If the `tokenKey` option is present, and a valid token is found, the original raw token
is made available to subsequent middleware as `ctx.state[opts.tokenKey]`.

This module also support tokens signed with public/private key pairs. Instead
of a secret, you can specify a Buffer with the public key:

```js
var publicKey = fs.readFileSync('/path/to/public.pub');
app.use(jwt({ secret: publicKey }));
```

If the `secret` option is a function, this function is called for each JWT received in
order to determine which secret is used to verify the JWT.

The signature of this function should be `(header, payload) => [Promise(secret)]`, where
`header` is the token header and `payload` is the token payload. For instance to support JWKS token header should contain `alg` and `kid`: algorithm and key id fields respectively.

This option can be used to support JWKS (JSON Web Key Set) providers by using
[node-jwks-rsa](https://github.com/auth0/node-jwks-rsa). For example:

```js
const { koaJwtSecret } = require('jwks-rsa');

app.use(jwt({ 
  secret: koaJwtSecret({
    jwksUri: 'https://sandrino.auth0.com/.well-known/jwks.json',
    cache: true,
    cacheMaxEntries: 5,
    cacheMaxAge: ms('10h') 
  }),
  audience: 'http://myapi/protected',
  issuer: 'http://issuer' 
}));
```

## Related Modules

* [jsonwebtoken](https://github.com/auth0/node-jsonwebtoken) — JSON Web Token signing and verification.

Note that koa-jwt no longer exports the `sign`, `verify` and `decode` functions from `jsonwebtoken` in the koa-v2 branch.

## Tests

```bash
npm install
npm test
```

## Authors/Maintainers

* [Stian Grytøyr](https://github.com/stiang) (initial author)
* [Scott Donnelly](https://github.com/sdd) (current maintainer)

## Credits

The initial code was largely based on [express-jwt](https://github.com/auth0/express-jwt).

* [Auth0](http://auth0.com/)
* [Matias Woloski](http://github.com/woloski)

## Contributors

* [Foxandxss](https://github.com/Foxandxss)
* [soygul](https://github.com/soygul)
* [tunnckoCore](https://github.com/tunnckoCore)
* [getuliojr](https://github.com/getuliojr)
* [cesarandreu](https://github.com/cesarandreu)
* [michaelwestphal](https://github.com/michaelwestphal)
* [Jackong](https://github.com/Jackong)
* [danwkennedy](https://github.com/danwkennedy)
* [nfantone](https://github.com/nfantone)
* [scttcper](https://github.com/scttcper)
* [jhnns](https://github.com/jhnns)
* [dunnock](https://github.com/dunnock)
* [3imed-jaberi](https://github.com/3imed-jaberi)

## License

[MIT](/LICENSE)

jwt

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