How to remove double quotes in laravel stdClass [duplicate]

I am getting: "{"lesson_type":"quiz","questions":[],"transcript":"storage\/1626421168176448258ktzpvaqnefg.txt","extra_contributors":null}"

But I want: {"lesson_type":"quiz","questions":[],"transcript":"storage\/1626421168176448258ktzpvaqnefg.txt","extra_contributors":null}

I just want to remove the double quotes from start and end.

via Chebli Mohamed