FastAPI
FastAPI is a modern, high-performance Python web framework for building APIs, built on top of Starlette (for async HTTP) and Pydantic (for data validation). It automatically generates interactive API documentation (Swagger/OpenAPI), provides type-safe request/response handling, and supports async/await for concurrent operations. FastAPI has become the go-to choice for building AI agent backends and LLM-powered API services because of its speed, developer experience, and native Pydantic integration. It handles WebSocket connections for streaming LLM responses and integrates seamlessly with Python AI libraries.
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Related Terms
Pydantic
Frameworks & ToolsPydantic is the most widely used data validation library for Python, using type annotations to define data schemas and automatically validate, serialize, and transform data.
Pydantic AI
Frameworks & ToolsPydantic AI is a Python agent framework built by the creators of Pydantic, designed for building production-grade AI agent applications with type safety and validation at the core.
WebSocket Streaming
InfrastructureWebSocket streaming uses the WebSocket protocol to establish a persistent, full-duplex communication channel between the client and server, enabling real-time bidirectional data flow.
API Gateway
InfrastructureAn API gateway is a reverse proxy that sits between clients and backend services, providing a single entry point for API requests.
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