Handling validation errors

By default if the client sends a body that doesn’t satisfy the schema a 400 bad request response will be sent. You can alter this by adding an error handler, for example for a JSON error response,

from quart_schema import RequestSchemaValidationError

@app.errorhandler(RequestSchemaValidationError)
async def handle_request_validation_error(error):
    return {"error": "VALIDATION"}, 400

or if you prefer to let the requestor know exactly why the validation failed you can utilise the validation_error attribute which is a either Pydantic ValidationError or a TypeError,

from quart_schema import RequestSchemaValidationError

@app.errorhandler(RequestSchemaValidationError)
async def handle_request_validation_error(error):
    if isinstance(error.validation_error, TypeError):
        return {
          "errors": str(error.validation_error),
        }, 400
    else:
        return {
          "errors": error.validation_error.json(),
        }, 400