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Repository Structure

If you plan on contributing to LangChain code or documentation, it can be useful to understand the high level structure of the repository.

LangChain is organized as a monorepo that contains multiple packages.

Here's the structure visualized as a tree:

├── docs
│ ├── core_docs # Contains content for the documentation here:
│ ├── api_refs # Contains content for the API refs here:
├── langchain # Main package
│ ├── src/**/tests/*.test.ts/ # Unit tests (present in each package not shown for brevity)
│ ├── src/**/tests/*.int.test.ts/ # Integration tests (present in each package not shown for brevity)
├── langchain # Base interfaces for key abstractions
├── libs # Community packages
│ ├── langchain-community # Third-party integrations
│ ├── langchain-partner-1
│ ├── langchain-partner-2
│ ├── ...

The root directory also contains the following files:

  • package.json: Dependencies for building docs and linting docs.

There are other files in the root directory level, but their presence should be self-explanatory. Feel free to browse around!


The /docs directory contains the content for the documentation that is shown at and the associated API Reference

See the documentation guidelines to learn how to contribute to the documentation.


The /libs directory contains the code for the LangChain packages.

To learn more about how to contribute code see the following guidelines:

  • Code Learn how to develop in the LangChain codebase.
  • Integrations to learn how to contribute to third-party integrations to langchain-community or to start a new partner package.
  • Testing guidelines to learn how to write tests for the packages.

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