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LangServe

Deploy LangChain runnables as a REST API.

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What is LangServe?

LangServe is deploy LangChain runnables as a REST API.

About

LangServe is a tool designed for developers to deploy LangChain runnables and chains as REST APIs. It integrates with FastAPI and uses Pydantic for data validation, providing features like automatic schema inference and efficient endpoints for concurrent requests. While it continues to accept community bug fixes, new projects are recommended to use the LangGraph Platform instead.

Strengths

  • Automatic schema inference and validation
  • Supports concurrent requests efficiently
  • Built on reliable open-source libraries
  • Includes a client SDK for easy integration
  • Provides a playground for testing APIs

Limitations

  • Not recommended for new projects in favor of LangGraph
  • Limited support for client callbacks
  • Older versions have known issues with OpenAPI docs
  • Requires familiarity with FastAPI and Pydantic
  • Community-driven bug fixes may limit feature updates

Use Cases

Deploying machine learning models as REST APIsCreating interactive applications with streaming outputsIntegrating with existing LangChain workflowsBuilding custom APIs for data retrievalRapid prototyping of AI applications

Integrations

FastAPIPydanticLangChainLangSmithLangGraph