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FastAPI · Decorator

@app.exception_handler

@app.exception_handler() registers a function that handles a chosen exception class or HTTP status code. The function receives the request and exception, then returns the response for the error.

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Syntax

app.exception_handler(exc_class_or_status_code)

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  • FastAPI
  • Request
  • JSONResponse
  • HTTPException
  • RequestValidationError
  • StarletteHTTPException
  • http_exception_handler
  • request_validation_exception_handler

Source: FastAPI class - FastAPI. Checked 2026-11-03.