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Build context-aware, reasoning applications with LangChain’s flexible abstractions and AI-first toolkits.

Core OSS libraries:

Products:

  • LangSmith - platform for building and monitoring production-grade LLM applications
  • LangGraph Platform - infrastructure for deploying LangGraph agents

OSS extensions and apps:

  • ChatLangChain and ChatLangChain.js - chatbot for answering questions about LangChain's open source libraries
  • Open Canvas - document & chat-based UX for writing code or markdown. Inspired by OpenAI's Canvas (TypeScript)
  • OpenGPTs - open source version of OpenAI's GPTs API (Python)
  • Email assistant - AI assistant that helps you maintain your emails (Python)
  • LangChain + Next.js template - template LangChain.js + Next.js application
  • Social media agent - agent for sourcing, curating, and scheduling social media posts with human-in-the-loop (TypeScript)
  • Agent Protocol - Agent Protocol is our attempt at codifying the framework-agnostic APIs that are needed to serve LLM agents in production

Learn more

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Repositories

Showing 10 of 189 repositories
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    langchain-ai/langchainjs’s past year of commit activity
    TypeScript 14,644 MIT 2,503 94 (7 issues need help) 89 Updated May 28, 2025
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    langchain-ai/langchain-aws’s past year of commit activity
    Python 169 MIT 156 64 (1 issue needs help) 24 Updated May 28, 2025
  • langchain-ai/langchain-redis’s past year of commit activity
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    langchain-ai/langsmith-docs’s past year of commit activity
    JavaScript 122 MIT 64 50 6 Updated May 28, 2025
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    langchain-ai/langgraphjs’s past year of commit activity
    TypeScript 1,527 MIT 220 95 19 Updated May 28, 2025
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    Jupyter Notebook 156 MIT 52 9 5 Updated May 28, 2025
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    langchain-ai/Fullstack-Chat-Repo’s past year of commit activity
    TypeScript 2 MIT 0 0 0 Updated May 28, 2025
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    langchain-ai/langgraph’s past year of commit activity
    Python 13,201 MIT 2,232 75 49 Updated May 28, 2025
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    Python 1,877 MIT 160 27 5 Updated May 28, 2025