LangChain overview for Node.js

Short summary

LangChain.js standardizes building LLM applications in Node.js by composing prompts, models, tools, and document loaders into reusable pipelines and agents. High-level APIs (createAgent, LCEL chains) run on LangGraph for orchestration, with LangSmith for tracing. Use Deep Agents for multi-step tasks, LangChain for RAG pipelines, or LangGraph for custom stateful workflows.

• •LangChain.js provides high-level abstractions for building LLM applications with composable Runnable chains (LCEL)
• •Ecosystem includes LangGraph (low-level orchestration), Deep Agents (batteries-included harness), and LangSmith (observability)
• •Choose based on needs: createAgent for minimal harness, LangChain for RAG/multi-step pipelines, LangGraph for custom workflows

Generated with AI, which can make mistakes.