fastapi

Build Python APIs with FastAPI, Pydantic v2, and SQLAlchemy 2.0 async. Covers project structure, JWT auth, validation, and database integration with the uv package manager. Prevents seven documented errors. Use when: creating Python APIs, implementing JWT authentication, or troubleshooting 422 validation errors, CORS misconfiguration, event-loop blocking, form-data handling, background-task pitfalls, or OpenAPI schema issues.