LangChain
Framework for building LLM-powered applications
About LangChain
LangChain is the leading framework for building applications powered by LLMs. Provides chains, agents, retrieval-augmented generation (RAG), and tool-use patterns. Available in Python and JavaScript.
Best for
Best for developers building complex LLM applications with chains, agents, and RAG
Pros & Cons
Pros
- Most popular LLM application framework
- Extensive integrations with LLMs, tools, and data sources
- Active community and rapid development
Cons
- Abstraction can add unnecessary complexity
- Rapidly changing API — breaking changes common
- Over-engineering risk for simple use cases
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