Validation Error

Returned when an inbound JSON body fails to parse, or when a path parameter (e.g. an Id) cannot be deserialised. The errors map contains a single entry keyed by "body" or "id" depending on which extractor rejected the request.

For rule-constraint failures on a valid body (e.g. #[field(min_length = 1)]), see validation_failed (422).

Example RFC 7807 body — malformed JSON

{
  "type":   "https://ferra.rs/errors/validation",
  "title":  "Validation Error",
  "status": 400,
  "detail": "validation failed",
  "errors": {
    "body": ["invalid character '}' at line 1 column 12"]
  }
}

← All error types