FastAPI
Typed, async API framework built on type hints.
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This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.
Lessons
- Your first FastAPI appPath operations, type-driven validation, automatic OpenAPI docs, and the route-ordering trap that silently returns 422 instead of 404.
- Pydantic request and response modelsDefine the wire contract with Pydantic: validation, custom validators, and response models that stop internal fields leaking out of your API.
- Dependencies and asyncReusable dependencies with Depends, yield-based resource cleanup, and the blocking-call mistake that stalls an entire async worker.
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Last refreshed 2026-09-17.