fastapi

FastAPI automates building high-performance Python APIs using routing, Pydantic models for data validation, and dependency injection. Install fastapi and uvicorn, define routes with typed parameters, and run uvicorn app.main:app --reload to start your server.

Yes, FastAPI natively supports WebSockets for real-time, asynchronous workflows. Define WebSocket endpoints alongside standard routes, and FastAPI handles connection management and message broadcasting automatically.

FastAPI integrates with standard Python testing patterns. Write tests using pytest to validate routes, request/response handling, and business logic, then structure your project modularly so tests run against isolated components before deploying.

FastAPI supports background tasks and asynchronous workflows natively. Define async functions as route handlers or use BackgroundTasks to offload work without blocking responses, enabling scalable, non-blocking API behavior.

Deployment requires FastAPI, Uvicorn, and a production-grade server or container platform. Structure your project modularly, configure environment variables, containerize with Docker if needed, and deploy to handle real-world traffic and scaling demands.

FastAPI works independently without a database for simple APIs. Optional database integration tools and ORMs can be added for persistence, but routing, validation, and WebSocket support function standalone.