# validation_failed: A value is not valid

Status 400.

## Why it happens

A value in the path or the query is not one the endpoint takes: a bare word where a domain name belongs, an ending the catalog does not hold, a date in the wrong form, a `limit` that is not a positive integer.

## What to do

Read `detail`, which names the value, and send it in the form the endpoint's request table gives. A refused domain name adds `reason`, and `suggestion` when there is a likely name.

## Example

```json
{
  "type": "https://unique.domains/api/problems/validation_failed",
  "title": "A value is not valid",
  "status": 400,
  "detail": "A bare word is not a domain name: add its ending (`example.com`).",
  "instance": "/v1/names/harbor",
  "code": "validation_failed",
  "reason": "not_a_name",
  "suggestion": null
}
```

All errors: https://unique.domains/api/problems