Class Firebase\JWT\JWT not found

Question

I want to use pure firebase/php-jwt library in my code. Firstly, I go to /var/www/html/ and like the official library page is suggesting, I do this

Answer 1

depends whether you are using composer or not, in case of not using composer try to remove the use part:

namespace Firebase\JWT;
use \DomainException;
use \InvalidArgumentException;
use \UnexpectedValueException;
use \DateTime;

and if you are using composer make sure your autoloader if loaded