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

The LangChain Libraries:

• LangChain (Python)
• LangChain JS (JavaScript/TypeScript)

Our Products:

• LangSmith - the platform for building production-grade LLM applications

Extensions:

• LangServe - deploy LangChain runnables and chains as a REST API (Python)
• OpenGPTs - Open-source effort to create a similar experience to OpenAI's GPTs and Assistants API (Python)
• LangGraph - build language agents as graphs (Python)
• LangGraph JS - LangGraph in JavaScript (JavaScript/TypeScript)

Live Demos:

• ChatLangChain - LangChain-powered chatbot focused on question answering over the LangChain documentation (Python)
• ChatLangChain JS - ChatLangChain in JavaScript (JavaScript/TypeScript)
• WebLangChain - LangChain-powered web research chatbot (Python)

Learn more

Section	Description
Company Website	LangChain product and company info
Python Documentation	Get started with the Python library
JavaScript Documentation	Get started with the JavaScript library