post("/items/") def create_item(item: Item): return item. You create a model by subclassing BaseModel , declaring fields with their respective types and default values.
FastAPI Quickstart Organize Routers: Structuring Your API Endpoints
FastAPI validates these parameters and converts them to the correct Python type before the function executes. You can create this isolated environment with the venv module included in the standard library.
The fastapi package contains the core framework, while uvicorn provides the production-ready server gateway interface. get("/items/{item_id}") def read_item(item_id: int, q: str = None): return {"item_id": item_id, "query": q} In this example, item_id is a required integer path parameter, while q is an optional string query parameter.
FastAPI Quickstart: Organize Routers for Scalable APIs
For teams moving from traditional Flask or Django REST frameworks, FastAPI offers a smoother transition without sacrificing control over HTTP details. Request Body Validation with Pydantic For operations that create or update resources, FastAPI integrates seamlessly with Pydantic to define complex request bodies.
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