# E008

invalid field name or reserved `$` key

**Error**: invalid field name or reserved `$` key.

A version with this finding cannot be published.

## Example

The contract fixture `E008-reserved-field-key` reports `E008` at `extract.$weird`:

```json
{
  "kaab": "1",
  "steps": [
    {
      "goto": "https://example.com/"
    }
  ],
  "extract": {
    "$weird": "h1"
  }
}
```