LangChain.js

Framework for building LLM-powered applications. Provides abstractions for chat models, chains, agents, RAG, and memory with support for multiple providers.

Quick Start

npm install langchain @langchain/openai @langchain/core

Basic Chat

import { ChatOpenAI } from '@langchain/openai';

const model = new ChatOpenAI({
  modelName: 'gpt-4o',
  temperature: 0.7,
});