LangChain.js

LangChain.js is a comprehensive TypeScript framework for building applications powered by large language models. It provides standardized interfaces for connecting LLMs with diverse data sources, tools, and external systems through a modular architecture.

When to Use

• Building AI agents with tool-calling capabilities
• Creating chatbots with conversation memory
• Implementing Retrieval Augmented Generation (RAG) systems
• Connecting LLMs to external data sources and APIs
• Building chains of LLM operations
• Switching between AI providers without code changes
• Streaming LLM responses in real-time
• Implementing structured output from LLMs
• Creating document Q&A systems
• Building semantic search applications

Core Concepts