FastAPI + async Python: Patterns I Use Every Day
Background tasks, dependency injection, and keeping APIs predictable when you mix sync and async code.
Oct 1, 2025•10 min read
Why FastAPI
Type hints double as validation. OpenAPI docs come for free. For ML backends that expose models, it is a sweet spot.
Async carefully
Not every library is async-safe. Sometimes a thread pool around blocking code is the honest fix.
Structure
Keep routers thin, services testable, and settings in one place. Your future self will thank you.
One rule
Return explicit error shapes in production so clients can handle failures without guessing.
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