FastAPI uses Python's type system
FastAPI is a modern framework for building APIs. Type annotations and validation models help define request and response contracts and enable automatic OpenAPI documentation.
Validate at the API boundary
Path parameters, query parameters and request bodies should have explicit types and constraints. After validation, business services can work with cleaner data.
Keep framework code separate from business logic
FastAPI makes route creation concise, but a growing application should avoid placing all business rules in route functions. Services and repositories can keep the application easier to test and change.
Practice: create a typed POST endpoint for a product, validate its fields and return the validated representation.
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