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Application Basics
FastAPI app uvicorn development server path operation path parameter query parameter request body Pydantic model response model status code response headers
Validation
field constraints optional fields nested models list validation custom validator model validator query constraints path constraints header parameters cookie parameters
Dependencies
Depends basics dependency with parameters class dependency sub-dependencies dependency caching yield dependency database session dependency authentication dependency router dependencies global dependencies
Routing & Responses
APIRouter router prefix router tags JSONResponse RedirectResponse FileResponse StreamingResponse custom response class exception handler HTTPException
Security
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Async & Integration
async endpoint sync endpoint behavior background tasks WebSocket endpoint lifespan context file upload form data external API with httpx async database query task cancellation
Testing
TestClient dependency override async test request validation test auth test WebSocket test mock external API startup lifespan test response schema test error handler test
Production
OpenAPI customization docs URLs logging trusted hosts HTTPS redirect workers health endpoint readiness endpoint database pool deployment checklist
FastAPI / Dependencies

class dependency

Learn class dependency in FastAPI with a dedicated explanation, a topic-specific example, edge guidance, and a mastery check.

12 min read • Intermediate
fastapi-023.py
python 
class Paging:
    def __init__(self, page:int=1, size:int=20): self.page=page; self.size=size
@app.get("/invoices")
def list(p:Paging=Depends()): return vars(p)
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