JavaScript

LangGraph TypeScript (@langchain/langgraph) lets you build stateful, graph-based AI agents in Node.js with full type safety. As of 2026, it handles StateGraph, conditional edges, checkpointing, streaming, and human-in-the-loop — feature-parity with the Python version — and sees over 42,000 weekly npm downloads. What Is LangGraph TypeScript (and Why It Matters in 2026) LangGraph TypeScript is a production-ready library for building stateful AI agent systems using a directed graph model, where nodes represent actions and edges represent transitions between states. Unlike simple chain-based frameworks, LangGraph lets agents loop, branch, pause for human input, and recover from failures without losing context. It reached full production stability in mid-2025, with feature parity to the Python version including StateGraph, conditional edges, checkpointing, streaming, and human-in-the-loop (HITL). The @langchain/langgraph npm package now records over 42,000 weekly downloads as of April 2026, making it the most-used graph-based agent framework in the JavaScript ecosystem. ...