LangChain Reference home page

GitHub
Main Docs

LangGraph

Web
Channels
Pregel
Prebuilt
Remote

LangGraph SDK

Client
Auth
React
Logging
React Ui
Server

LangGraph Checkpoint

LangGraph Checkpoint MongoDB

LangGraph Checkpoint Postgres

Store

LangGraph Checkpoint Redis

Shallow
Store

LangGraph Checkpoint SQLite

LangGraph Checkpoint Validation

Cli

LangGraph API

LangGraph CLI

LangGraph CUA

Utils

LangGraph Supervisor

LangGraph Swarm

⌘I

LangChain Assistant

Ask a question to get started

Enter to send•Shift+Enter new line

Menu

Web Channels Pregel Prebuilt Remote

Client Auth React Logging React Ui Server

LangGraph Checkpoint

LangGraph Checkpoint MongoDB

LangGraph Checkpoint Postgres

LangGraph Checkpoint Redis

LangGraph Checkpoint SQLite

LangGraph Checkpoint Validation

LangGraph Supervisor

LangGraph Swarm

Language

Theme

JavaScript@langchain/langgraphwebSTART

Variable●Since v0.3

START

Special reserved node name denoting the start of a graph.

Copy

START: "__start__"

Used in Docs

Build a custom RAG agent with LangGraph
Build a custom SQL agent
Build a multi-source knowledge base with routing
Choosing between Graph and Functional APIs
Custom workflow

View source on GitHub