Mistral API 422 Validation error: what it means and how to fix it

What it means

The request is well-formed JSON but contains invalid parameter values. In the Python SDK this surfaces as HTTPValidationError (status code 422), a subclass of MistralError.

Causes

• Wrong data type for a field (for example string instead of number)
• Enum value not in the allowed set
• Array length exceeding limits

How to fix it

1. 1
   Fix 1.

   Check the response body for detailed field-level validation errors and cross-reference with the API schema. In the Python SDK, inspect the validation details:

   Snippet

   Copy

   if isinstance(e, errors.HTTPValidationError):
               print(e.data.detail)  # Optional[List[models.ValidationError]]