LangChain JS Tools

About

LangChain JS gives JavaScript and TypeScript developers composable interfaces for agents, models, tools, retrievers, and vector stores so LLM application code does not couple to any one provider's SDK. It runs on Node 20/22/24, edge runtimes, Deno, Bun, and browsers, and integrates with the wider LangChain ecosystem — LangGraph.js for orchestration, Deep Agents for higher-level planning packages, LangSmith for observability. Application developers use it to assemble chat, RAG, and agent products rather than to run a coding loop; teams that need a coding harness typically build one on LangGraph or Deep Agents instead. It is MIT-licensed and actively maintained with 18k+ stars.

Other entries by langchain-ai

• Open SWE — agent
• Deep Agents Code — agent-sdk