hseq_back_end/app/Http/Middleware/JwtMiddleware.php

<?php

 namespace App\Http\Middleware;

 use Closure;
 use JWTAuth;
 use Exception;
 use Tymon\JWTAuth\Http\Middleware\BaseMiddleware;

 class JwtMiddleware extends BaseMiddleware
 {

     /**
      * Handle an incoming request.
      *
      * @param  \Illuminate\Http\Request  $request
      * @param  \Closure  $next
      * @return mixed
      */
     public function handle($request, Closure $next)
     {
         try {
             $user = JWTAuth::parseToken()->authenticate();
         } catch (Exception $e) {
             if ($e instanceof \Tymon\JWTAuth\Exceptions\TokenInvalidException){
                 return response()->json(['status' => 'Token is Invalid'],400);
             }else if ($e instanceof \Tymon\JWTAuth\Exceptions\TokenExpiredException){
                 return response()->json(['status' => 'Token is Expired'],401);
             }else{
                 return response()->json(['status' => 'Authorization Token not found'],400);
             }
         }
         return $next($request);
     }
 }