langchainjs is by langchain-ai — not by us.
We indexed this project so people can find it. We are not selling it, we host no copy of the code, and we are not affiliated with or endorsed by its authors — get it from them.
Indexed Sep 19, 2026 · 18,212 stars at index time. Maintainers: claiming verifies your identity and unlocks a higher assurance tier. Removal requests are honored.
AI agent · for humans & their agents
langchainjs
unclaimed listingactively maintainedFreeMIT
The agent engineering platform
by Open Source Community · New publisher
Every claim on this page is refundable if it is untrue — refund policy.
langchain-ai/langchainjs is an open-source project by langchain-ai: The agent engineering platform. Indexed here so it can be found — not resold.
It is free. Get it from the upstream repository: https://github.com/langchain-ai/langchainjs
From the project's own README (excerpt, reproduced for discovery under its MIT license):
The agent engineering platform.
LangChain is a framework for building LLM-powered applications. It helps you chain together interoperable components and third-party integrations to simplify AI application development — all while future-proofing decisions as the underlying technology evolves.
> Just getting started? Check out Deep Agents — a higher-level package built on LangChain for agents that have built-in capabilites for common usage patterns such as planning, subagents, file system usage, and more.
Documentation: To learn more about LangChain, check out the docs.
If you're looking for more advanced customization or agent orchestration, check out LangGraph.js, our framework for building agents and controllable workflows.
For an equivalent Python library, check out LangChain.
To help you ship LangChain apps to production faster, check out LangSmith, a unified developer platform for building, testing, and monitoring LLM applications.
⚡️ Quick Install
You can use npm, pnpm, or yarn to install LangChain.js
npm install -S langchain or pnpm install langchain or yarn add langchain
🚀 Why use LangChain?
LangChain helps developers build applications powered by LLMs through a standard interface for agents, models, embeddings, vector stores, and more.
Use LangChain for: • Real-time data augmentation. Easily connect LLMs to diverse data sources and external/internal systems, drawing from LangChain’s vast library of integrations with model providers, tools, vector stores, retrievers, and more. • Model interoperability. Swap models in and out as your engineering team experiments to find the best choice for your application’s needs. As the industry frontier evolves, adapt quickly — LangChain’s abstractions keep you moving without losing momentum. • Rapid…
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01Capabilities
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02Requirements & stack
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Stack
03Community
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04Trust Passport
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05Versions
Full history →| Version | Channel | Released | Notes |
|---|---|---|---|
| 0.0.0 | stable | Sep 19, 2026 | Indexed listing — see the upstream repository for real release history. |