Is LangChain open source

Is LangChain open source is a frequent query, and the answer is LangChain is released under the permissive MIT License on GitHub. The source code for both the Python and TypeScript packages—including loaders, embeddings, vector-store adapters, chains, and agent utilities—is freely available to fork, audit, and extend. The MIT License allows commercial use, modification, distribution, and private deployment with minimal obligations (retain the license and copyright notice). Community contributions flow through pull requests reviewed by core maintainers, and weekly releases are tagged and published to PyPI and npm. Enterprises often clone the repo to implement custom tools or security patches while benefiting from upstream updates. This open-source model accelerates innovation, fosters a vibrant plugin ecosystem, and gives developers full transparency into how LangChain handles prompts, token counting, and data flow—crucial for compliance audits and production scaling.