JSON.parse: unexpected character at line 1 column 1 of the JSON data

When accessing the home `http://localhost/request-docs`, appears notification:

    JSON.parse: unexpected character at line 1 column 1 of the JSON data

<img width="971" height="729" alt="Image" src="https://github.com/user-attachments/assets/b431c72c-c1d9-4334-a319-0cb8b23bf433" />

I'm using:
- PHP 8.2
- Laravel 13