# invalid_placeholder

> A mapping key is empty, longer than 128 UTF-16 code units, has surrounding spaces, contains NUL or a lone surrogate, or is `__proto__`, `constructor` or `prototype`.

HTTP status: 400

## What to do

Send mapping exactly as POST /v1/redact returned it.

## Example

```json
{
  "error": "invalid_placeholder",
  "request_id": "0f8e2c4a-6b1d-4e3f-9a7c-5d2b8e1f4a60",
  "doc_url": "https://developers.komplai.dk/errors/invalid_placeholder"
}
```

## Operations that can return it

- POST /v1/redact/restore (https://developers.komplai.dk/reference/redact.md)

---

https://developers.komplai.dk/errors/invalid_placeholder