Skip to main content
Comprehensive API reference documentation for the LangChain and LangGraph Python and TypeScript libraries.

Reference sites

https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1776781739-618af97/uRoLt3OyNDGaDgBI/images/brand/langchain-icon.png?fit=max&auto=format&n=uRoLt3OyNDGaDgBI&q=85&s=5a231b10217203aecdae4c6965b9eb1f

LangChain

Complete API reference for LangChain JavaScript/TypeScript, including chat models, tools, agents, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1776781739-618af97/uRoLt3OyNDGaDgBI/images/brand/langgraph-icon.png?fit=max&auto=format&n=uRoLt3OyNDGaDgBI&q=85&s=4813ebe2306021298a11e8468ec86054

LangGraph

Complete API reference for LangGraph JavaScript/TypeScript, including graph APIs, state management, checkpointing, and more.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1776781739-618af97/uRoLt3OyNDGaDgBI/images/brand/deep-agents-icon.png?fit=max&auto=format&n=uRoLt3OyNDGaDgBI&q=85&s=658be637580509210f1a1440b771fdb8

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks

LangChain Integrations

LangChain packages to connect with popular LLM providers, vector stores, tools, and other services.

MCP Adapter

Use Model Context Protocol (MCP) tools within LangChain and LangGraph applications.
https://mintcdn.com/langchain-5e9cc07a-preview-opensw-1776781739-618af97/uRoLt3OyNDGaDgBI/images/brand/deep-agents-icon.png?fit=max&auto=format&n=uRoLt3OyNDGaDgBI&q=85&s=658be637580509210f1a1440b771fdb8

Deep Agents

Build agents that can plan, use subagents, and leverage file systems for complex tasks.