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How can you modify FastAPI's validation error response to include a custom error code along with the default error details?

hard🚀 Application Q9 of 15
FastAPI - Error Handling
How can you modify FastAPI's validation error response to include a custom error code along with the default error details?
AUse a middleware to append the custom code to all JSON responses
BSet a global variable with the custom code and access it in the route
CModify the Pydantic model to include a custom error code attribute
DCreate an exception handler for RequestValidationError that adds a custom 'code' field to the response JSON
Step-by-Step Solution
Solution:

  1. Step 1: Recognize how to customize validation error responses

    Exception handlers for RequestValidationError allow modifying the response content.

  2. Step 2: Add a custom field in the JSON response

    Within the handler, include a 'code' field alongside the default error details in the JSONResponse.

  3. Final Answer:

    Create an exception handler for RequestValidationError that adds a custom 'code' field to the response JSON -> Option D

  4. Quick Check:

    Add custom fields in exception handler response JSON [OK]
Quick Trick: Add custom fields in validation error handler JSON [OK]
Common Mistakes:
MISTAKES
  • Trying to modify Pydantic models for error codes
  • Using middleware for selective error response changes
  • Using global variables instead of handlers

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