# validation_failed (HTTP 400): meaning and fix

Fix: read the errors array, correct each field its JSON Pointer names, and retry safely. validation_failed (HTTP 400) means the request failed schema checks.

- **HTTP status:** 400
- **Problem type URI:** https://nowgetitdone.com/docs/api/problems/validation-failed

## What it means

The request body or query failed schema validation. The `errors` array names each offending field by JSON Pointer.

## Likely causes

- A required field was missing or had the wrong type.
- A value fell outside its allowed range or enum.
- A cursor was reused with different filters than the page it came from.

## How to fix

- Read the `errors` array — each entry has a `pointer`, a `code`, and a `message`.
- Fix the named field and retry. The request was never applied, so retrying is safe.

## Example problem+json

```json
{
    "type": "https://nowgetitdone.com/docs/api/problems/validation-failed",
    "title": "Request validation failed",
    "status": 400,
    "code": "validation_failed",
    "request_id": "req_a1b2c3d4"
}
```

## Related

- [Errors](/docs/api#errors)