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- Last pushed
- Updated Oct 2026
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LangChain.js
LangChain.js is the TypeScript edition of LangChain, a framework for LLM-powered applications that runs on Node.js, Cloudflare Workers, Vercel and Next.js, Supabase Edge Functions, browsers, Deno, and Bun.
- Stars
- 18.3k
- Language
- TypeScript
- License
- MIT
- Reading time
- 2 min
- Published by
- Community
- Author
- LangChain
- Last verified
- Oct 2026
- Languages
- TypeScript
- Capabilities
- Open source
Highlights
- Install with npm install -S langchain, or the pnpm and yarn equivalents.
- Documented environments: Node.js 20/22/24 in ESM and CommonJS, Cloudflare Workers, Vercel/Next.js, Supabase Edge, browser, Deno, and Bun.
- 18,270 stars, MIT-licensed, created February 2023, last pushed 2026-10-14.
- LangGraph.js is cited in the README as trusted in production by LinkedIn, Uber, Klarna, and GitLab.
- Deep Agents (JS), LangSmith, and LangSmith Deployment are the ecosystem pieces it links.
Quickstart
bash
npm install -S langchainWatch out
Copy reviewed against the repo README on 2026-10-15; it covers install, supported environments, and the ecosystem but never mentions Jev or TypeSafe, so the only link to this catalog is its placement on the cobanov and logicrw community lists.
Questions about this entry
Short answers drawn from the linked project or page.
The TypeScript edition of LangChain: a framework for building LLM-powered applications with a standard interface for agents, models, embeddings, and vector stores, plus a large library of third-party integrations.
Use npm install -S langchain, pnpm install langchain, or yarn add langchain. The README also points to the documentation, to LangGraph.js for agent orchestration, and to the Python LangChain for the equivalent library.
According to the README: Node.js 20.x, 22.x, and 24.x in ESM or CommonJS, Cloudflare Workers, Vercel and Next.js browser, serverless, and edge functions, Supabase Edge Functions, browsers, Deno, and Bun.
It is the JavaScript counterpart of the Python library, covering the same goals with JS/TS APIs; the README links back to langchain-ai/langchain for the Python edition.
No. The cobanov and logicrw community lists include it as a general agent framework, and nothing in the digest's README presents a Jev or TypeSafe integration, so none is claimed.
Actively maintained per the digest: 18,270 stars and 3,432 forks, MIT-licensed, created in February 2023, with the last push on 2026-10-14. The README explicitly invites contributions of features, infrastructure, and documentation.
LangSmith is described as a unified developer platform for building, testing, monitoring, and deploying LLM applications. The README links it alongside LangGraph.js, which it lists as trusted in production by LinkedIn, Uber, Klarna, and GitLab.
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