@anthropic-ai/sdk

Claude SDK for TypeScript

The Claude SDK for TypeScript provides access to the Claude API from server-side TypeScript or JavaScript applications.

Documentation

SDK helpers (streaming, structured outputs, tool helpers and the tool runner) are documented in helpers.md. The browser and computer toolset classes have their own guides, browser-toolset.md and computer-toolset.md.

Full documentation is available at platform.claude.com/docs/en/api/sdks/typescript.

Installation

npm install @anthropic-ai/sdk

Getting started

import Anthropic from '@anthropic-ai/sdk';

const client = new Anthropic({
  apiKey: process.env['ANTHROPIC_API_KEY'], // This is the default and can be omitted
});

const message = await client.messages.create({
  max_tokens: 1024,
  messages: [{ role: 'user', content: 'Hello, Claude' }],
  model: 'claude-opus-5-5',
});

console.log(message.content);

Requirements

TypeScript >= 5.0 is supported.

The following runtimes are supported:

• Node.js 20 LTS or later (non-EOL) versions.
• Deno v1.28.0 or higher.
• Bun 1.0 or later.
• Cloudflare Workers.
• Vercel Edge Runtime.
• Jest 28 or greater with the "node" environment ("jsdom" is not supported at this time).
• Nitro v2.6 or greater.
• Web browsers: disabled by default to avoid exposing your secret API credentials (see API key best practices). Enable browser support by explicitly setting dangerouslyAllowBrowser to true.

Note that React Native is not supported at this time.

If you are interested in other runtime environments, please open or upvote an issue.

Contributing

See CONTRIBUTING.md.

License

This project is licensed under the MIT License. See the LICENSE file for details.