Skip to content
Codeloom

Topics / FastAPI

FastAPI

Modern Python APIs. Routing, validation, async, and OpenAPI.

Browse 29 tutorials → Other topics

Why learn FastAPI?

  • Type hints double as request validation via Pydantic.

  • Auto-generated OpenAPI docs and a Swagger UI for free.

  • Native async support — handles I/O-heavy workloads well.

  • A natural pick for AI/ML APIs that wrap Python models.

What you can build with FastAPI

REST and JSON APIs Backends for ML models Webhook receivers and microservices Internal tools

FastAPI tutorials

29 articles · page 1 of 2

Hand-written tutorials, ordered as a recommended learning path.

  1. 01 What Is FastAPI? A clear introduction to FastAPI — ASGI and Starlette, Pydantic-driven validation, automatic OpenAPI docs, async support, and how it compares to Flask and Django.
  2. 02 Routes & Pydantic A practical guide to FastAPI routing and Pydantic v2 — path operations, path/query/body parameters, model validation, response_model, and response_model_exclude_unset.
  3. 03 Async & Dependencies A practical guide to async path operations and Depends() in FastAPI — when async actually helps, per-request DB sessions, auth dependencies, and how sub-dependencies compose.
  4. 04 FastAPI + SQLAlchemy A practical guide to FastAPI with SQLAlchemy 2.0 — typed models with Mapped and mapped_column, sessionmaker, get_db dependency, CRUD endpoints, and where Alembic fits.
  5. 05 FastAPI vs Django vs Flask Compare FastAPI, Django, and Flask for Python web development. Understand performance, features, and ecosystem differences to choose the right framework.
  6. 06 Background Tasks + Celery Learn to run background tasks in FastAPI using built-in BackgroundTasks and scale with Celery for distributed job processing.
  7. 07 Custom Middleware Build custom FastAPI middleware for request logging, CORS handling, authentication checks, and performance monitoring.
  8. 08 Advanced DI Patterns Master advanced FastAPI dependency injection with nested deps, class-based providers, yield dependencies, and shared state patterns.
  9. 09 Deploy: Docker + Gunicorn Deploy FastAPI to production with Docker, Gunicorn, Uvicorn workers, health checks, multi-stage builds, and best practices.
  10. 10 File Upload & Streaming Handle file uploads with validation, process large files with streaming, and serve dynamic streaming responses in FastAPI.
  11. 11 Rate Limiting (SlowAPI) Protect your FastAPI endpoints from abuse with SlowAPI rate limiting using fixed window, sliding window, and token bucket strategies.
  12. 12 Async SQLAlchemy Set up async SQLAlchemy 2.0 with FastAPI for non-blocking database operations using asyncpg, async sessions, and proper patterns.
  13. 13 Testing Strategies Build a robust test suite for FastAPI with TestClient, pytest fixtures, dependency overrides, and async testing patterns.
  14. 14 WebSockets Real-Time Build real-time features with FastAPI WebSockets including chat rooms, live notifications, and connection management patterns.
  15. 15 Background Tasks Run work after the response: FastAPI BackgroundTasks, Celery integration, task queues, and when to use each approach for emails, webhooks, data processing, and more.
  16. 16 Dependency Injection Master FastAPI's dependency injection system: Depends, sub-dependencies, database sessions, authentication, scoped dependencies, and testing with overrides.
  17. 17 FastAPI DI How FastAPI's Depends system actually works, the lifecycle of dependencies, scoping with yield, and patterns for testable, layered FastAPI apps.
  18. 18 FastAPI JWT Implement JWT-based authentication in FastAPI with OAuth2 password flow, secure token signing, and a reusable get_current_user dependency.
  19. 19 BG Tasks & Celery When FastAPI BackgroundTasks are enough, when you need Celery, and how to wire jobs that survive crashes, retries, and scale.
  20. 20 CORS Configure CORS in FastAPI without security holes: how the browser preflight works, which origins and headers to allow, credentials and cookies, and the most common misconfigurations to avoid.