How to add a user middleware in Laravel

I was building an API. I had already used auth:api middleware. I was sure that a user was logged in. However, I wanted to protect some of my routes further by only allowing an admin to access them. I was using level field in users table. A level 1 meant it was an admin. Hence, I created an Admin middleware to do what I had in mind. Here is how it can be done.

1. First of all, create a new middleware. It can be named anything you like
   php artisan make:middleware Middlewarename

2. Open app\Http\Middleware\Middlewarename.php

3. Then paste following code in handle() function

// ->level can be any field you like
if (\Auth::user()->level === 1) {
          return $next($request);
        } else {
            // redirect or throw error or anything you want;
        }

4. Then open app\Http\Kernel.php and add new middleware in $routeMiddleware
'admin' => \App\Http\Middleware\Middlewarename::class,

5. Then you can specify middleware in routes like below
   Route::get('/route', [AnyController::class, 'route'])->middleware('Middlewarename');