validation_exception_handler() — fastapi Function Reference

Architecture documentation for the validation_exception_handler() function in tutorial004_py39.py from the fastapi codebase.

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FastAPI→ Routing→ validation_exception_handler() — fastapi Function Reference

Dependency Diagram

graph TD
  6faca713_f793_c3cc_7ffd_0167b7a068f3["validation_exception_handler()"]
  38ef6f23_808c_5f1f_4d60_57127dfa4be4["tutorial004_py39.py"]
  6faca713_f793_c3cc_7ffd_0167b7a068f3 -->|defined in| 38ef6f23_808c_5f1f_4d60_57127dfa4be4
  7702da8c_3f6b_a8bb_d4ca_61939c372354["errors()"]
  6faca713_f793_c3cc_7ffd_0167b7a068f3 -->|calls| 7702da8c_3f6b_a8bb_d4ca_61939c372354
  style 6faca713_f793_c3cc_7ffd_0167b7a068f3 fill:#6366f1,stroke:#818cf8,color:#fff

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Source Code

docs_src/handling_errors/tutorial004_py39.py lines 15–19

async def validation_exception_handler(request, exc: RequestValidationError):
    message = "Validation errors:"
    for error in exc.errors():
        message += f"\nField: {error['loc']}, Error: {error['msg']}"
    return PlainTextResponse(message, status_code=400)