How to validate geojson files in laravel ??

[subhadipghorui]

I want to upload geojson files into my app. I can not validate geojson files in laravel 7. I used this code.
$this->validate($request, [ 'name' => 'required|max:255|unique:layers', 'workspace' => 'required|max:1', 'type' => 'required', 'layer-file' => 'required|file|mimes:zip,kml|mimetypes:application/geo+json', 'about' => 'sometimes|max:1000', 'type' => 'required', 'published' => 'required', ]);