Middleware in Laravel.

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In Laravel, middleware provides a convenient way to filter HTTP requests entering your application. It sits between the incoming request and the corresponding route handler, allowing you to perform various tasks such as authentication, authorization, input validation, and more.

Middleware acts as a bridge that intercepts the request and performs actions before it reaches the route or after the route has been executed. It allows you to modify the request or response objects, terminate the request early, or pass the request to the next middleware in the stack.

To create a middleware in Laravel, you can use the artisan command php artisan make:middleware or manually create a new class in the app/Http/Middleware directory. A middleware class contains two main methods: handle() and terminate().

The handle() method is where you define the logic that should be executed before passing the request to the next middleware or route handler. It receives the $request object and a $next closure as parameters. You can perform tasks such as modifying the request, validating input, checking authentication, or redirecting the user.

The terminate() method is optional and is called after the response has been sent to the browser. It allows you to perform additional tasks that should be executed after the request has been processed, such as logging or cleaning up resources.

Once you have created a middleware, you can apply it to routes or groups of routes using the middleware() method in your route definitions. For example:

Route::get('/dashboard', function () {
    // Logic for dashboard route
})->middleware('auth');

In this example, the 'auth' middleware will be executed before the closure function is called, ensuring that the user is authenticated before accessing the dashboard route.

Laravel provides several built-in middleware, such as auth, guest, throttle, and more. Additionally, you can create your own custom middleware to fit your application’s specific needs.

Middleware in Laravel is a powerful feature that allows you to add reusable and modular functionality to your application’s request handling process. It helps you keep your code clean, organized, and promotes separation of concerns.