# validation_failed — Shorty API error

> Validation failed (HTTP 400): when the Shorty API returns the validation_failed error, why, and how to fix it.

| Code | HTTP status | Type URI |
| --- | --- | --- |
| `validation_failed` | 400 | `https://aishorty.com/docs/api/errors/validation_failed` |

## When it happens

The request body or parameters failed schema validation. The `errors` array lists each offending field with a JSON pointer.

## Example response

```json
{
  "type": "https://aishorty.com/docs/api/errors/validation_failed",
  "title": "Validation failed",
  "status": 400,
  "detail": "One or more fields are invalid.",
  "instance": "urn:request:req_01J9Z8ABCDEFGH0123456789",
  "code": "validation_failed",
  "request_id": "req_01J9Z8ABCDEFGH0123456789"
}
```

## How to fix it

Fix the fields named in `errors[].pointer`. Validate against the operation schema before sending; the SDK gives you typed request bodies.

## Related errors

- [request_too_large](/docs/api/errors/request_too_large) — Request too large (HTTP 413)