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Claude SDK for TypeScript\n\n[![NPM version](![](\"https://raw.githubusercontent.com/stainless-api/sdk-assets/refs/heads/main/node.svg\")
**Node** [[docs](https://github.com/nodejs/undici/blob/main/docs/docs/api/ProxyAgent.md#example---proxyagent-with-fetch)]\n\n```ts\nimport Anthropic from '@anthropic-ai/sdk';\nimport * as undici from 'undici';\n\nconst proxyAgent = new undici.ProxyAgent('http://localhost:8888');\nconst client = new Anthropic({\n fetchOptions: {\n dispatcher: proxyAgent,\n },\n});\n```\n\n![](\"https://raw.githubusercontent.com/stainless-api/sdk-assets/refs/heads/main/bun.svg\")
**Bun** [[docs](https://bun.sh/guides/http/proxy)]\n\n```ts\nimport Anthropic from '@anthropic-ai/sdk';\n\nconst client = new Anthropic({\n fetchOptions: {\n proxy: 'http://localhost:8888',\n },\n});\n```\n\n![](\"https://raw.githubusercontent.com/stainless-api/sdk-assets/refs/heads/main/deno.svg\")
**Deno** [[docs](https://docs.deno.com/api/deno/~/Deno.createHttpClient)]\n\n```ts\nimport Anthropic from 'npm:@anthropic-ai/sdk';\n\nconst httpClient = Deno.createHttpClient({ proxy: { url: 'http://localhost:8888' } });\nconst client = new Anthropic({\n fetchOptions: {\n client: httpClient,\n },\n});\n```\n\n### Beta Features\n\nWe introduce beta features before they are generally available to get early feedback and test new functionality. You can check the availability of all of Claude's capabilities and tools [here](https://platform.claude.com/docs/en/api/overview).\n\nYou can access most beta API features through the beta property of the client. To enable a particular beta feature, you need to add the appropriate [beta header](https://platform.claude.com/docs/en/api/beta-headers) to the `betas` field when creating a message.\n\nFor example, to use code execution:\n\n```ts\nimport Anthropic from 'npm:@anthropic-ai/sdk';\n\nconst client = new Anthropic();\nconst response = await client.beta.messages.create({\n max_tokens: 1024,\n model: 'claude-sonnet-4-5-20250929',\n messages: [\n {\n role: 'user',\n content: [\n {\n type: 'text',\n text: \"What's 4242424242 * 4242424242?.\",\n },\n ],\n },\n ],\n tools: [\n {\n name: 'code_execution',\n type: 'code_execution_20250522',\n },\n ],\n betas: ['code-execution-2025-05-22'],\n});\n```\n\n## Frequently Asked Questions\n\n## Semantic versioning\n\nThis package generally follows [SemVer](https://semver.org/spec/v2.0.0.html) conventions, though certain backwards-incompatible changes may be released as minor versions:\n\n1. Changes that only affect static types, without breaking runtime behavior.\n2. Changes to library internals which are technically public but not intended or documented for external use. _(Please open a GitHub issue to let us know if you are relying on such internals.)_\n3. Changes that we do not expect to impact the vast majority of users in practice.\n\nWe take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.\n\nWe are keen for your feedback; please open an [issue](https://www.github.com/anthropics/anthropic-sdk-typescript/issues) with questions, bugs, or suggestions.\n\n## Requirements\n\nTypeScript >= 4.9 is supported.\n\nThe following runtimes are supported:\n\n- Node.js 20 LTS or later ([non-EOL](https://endoflife.date/nodejs)) versions.\n- Deno v1.28.0 or higher.\n- Bun 1.0 or later.\n- Cloudflare Workers.\n- Vercel Edge Runtime.\n- Jest 28 or greater with the `\"node\"` environment (`\"jsdom\"` is not supported at this time).\n- Nitro v2.6 or greater.\n- Web browsers: disabled by default to avoid exposing your secret API credentials (see our help center for [best practices](https://support.anthropic.com/en/articles/9767949-api-key-best-practices-keeping-your-keys-safe-and-secure)). Enable browser support by explicitly setting `dangerouslyAllowBrowser` to `true`.\n\n\n
\n\nNote that React Native is not supported at this time.\n\nIf you are interested in other runtime environments, please open or upvote an issue on GitHub.\n\n## Contributing\n\nSee [the contributing documentation](./CONTRIBUTING.md).\n","readmeFilename":"README.md"}More explanation
\nWhy is this dangerous?
\n Enabling thedangerouslyAllowBrowser option can be dangerous because it exposes your secret API credentials in the client-side code. Web browsers are inherently less secure than server environments,\n any user with access to the browser can potentially inspect, extract, and misuse these credentials. This could lead to unauthorized access using your credentials and potentially compromise sensitive data or functionality.\n When might this not be dangerous?
\n In certain scenarios where enabling browser support might not pose significant risks:\n- \n
- Internal Tools: If the application is used solely within a controlled internal environment where the users are trusted, the risk of credential exposure can be mitigated. \n
- Development or debugging purpose: Enabling this feature temporarily might be acceptable, provided the credentials are short-lived, aren't also used in production environments, or are frequently rotated. \n