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The official JavaScript SDK for UCP

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   Copyright 2026 UCP Authors

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<p align="center">
  <h1 align="center">UCP JavaScript SDK</h1>
</p>

<p align="center">
  <b>Official JavaScript library for the Universal Commerce Protocol (UCP).</b>
</p>

## Overview

This repository contains the JavaScript SDK for the
[Universal Commerce Protocol (UCP)](https://ucp.dev). It provides TypeScript
types and [Zod](https://zod.dev/) schemas for UCP models, making it easy to
build UCP-compliant applications in JavaScript and TypeScript.

### UCP Version Compatibility

Each version of the JavaScript SDK is generated against a specific version of the UCP schema:

| SDK Version | UCP Schema Version |
| ----------- | ------------------ |
| **`0.4.x`** | **`2026-04-08`**   |
| `0.1.1`     | `2026-01-23`       |
| `0.1.0`     | `2026-01-11`       |

## Installation

To install the SDK in your project, run:

```bash
npm install @ucp-js/sdk
```

## Usage

The SDK provides Zod schemas and TypeScript types for UCP models. You can use Zod to validate incoming data or ensure your outgoing data matches the specification.

### TypeScript / ES Modules

```typescript
import { CheckoutResponseSchema, CheckoutResponse } from "@ucp-js/sdk";

// Validate data against UCP schemas
const parseResult = CheckoutResponseSchema.safeParse(checkoutData);

if (parseResult.success) {
  const checkout: CheckoutResponse = parseResult.data;
  console.log(checkout.status); // "incomplete" | "ready_for_complete" | ...
  console.log(checkout.currency); // ISO 4217 currency code
} else {
  console.error(parseResult.error);
}
```

### CommonJS

```javascript
const { CheckoutResponseSchema } = require("@ucp-js/sdk");

const parseResult = CheckoutResponseSchema.safeParse(checkoutData);
if (parseResult.success) {
  const checkout = parseResult.data;
  // ...
}
```

## Development

### Prerequisites

This project uses `npm` for package management and `typescript` for building.

### Generating Models

The models are automatically generated from the JSON schemas in the
[UCP Specification](https://ucp.dev).

To regenerate the models, you first need a local copy of the
[UCP specification](https://github.com/Universal-Commerce-Protocol/ucp). If you
don't have one, you can clone it via:

```bash
git clone https://github.com/Universal-Commerce-Protocol/ucp.git
```

Then, run `npm run generate` pointing to the `spec` folder of the cloned
repository, e.g.:

```bash
npm run generate -- ucp/spec
```

### Building

To build the project for both CommonJS and ESM:

```bash
npm run build
```

## Contributing

We welcome community contributions. See our
[Contribution Guide](https://github.com/Universal-Commerce-Protocol/.github/blob/main/CONTRIBUTING.md)
for details.

## License

UCP is an open-source project under the [Apache License 2.0](LICENSE).

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