Example of using Data validation middleware in Laravel

Introduction:

A Data validation middleware in Laravel is a middleware that validates data before it is passed to the controller. This is useful for ensuring that the data passed to the controller is in the correct format and meets certain requirements. Here is an example of how you can create a Data validation middleware in Laravel:

Create a new middleware:

First, you need to create a new middleware using the following command:

php artisan make:middleware DataValidationMiddleware

This will create a new middleware class in the app/Http/Middleware directory.

Define the validation rules:

In the handle method of the middleware class, you can define the validation rules that the data must meet. For example, you can use the Validator facade to create a validation rule that checks if a required field is present and has a certain length:

use Illuminate\Support\Facades\Validator;

public function handle($request, Closure $next)
{
    $validator = Validator::make($request->all(), [
        'name' => 'required|max:255',
        'email' => 'required|email|max:255',
    ]);
    if ($validator->fails()) {
        return redirect()->back()
            ->withErrors($validator)
            ->withInput();
    }
    return $next($request);
}

Register the middleware:

Next, you need to register the middleware in the app/Http/Kernel.php file. You can register it as a global middleware or a route middleware depending on your needs.

Apply the middleware:

Finally, you can apply the middleware to the routes or controllers that need it. For example, if you want to apply it to all routes in a group, you can use the middleware method on the Route facade:

Route::middleware(DataValidationMiddleware::class)->group(function () {
    Route::post('/create', 'Controller@create');
    Route::post('/update', 'Controller@update');
});

In this example, the DataValidationMiddleware will be applied to all routes in the group, and the validation rules defined in the middleware will be checked before the request is passed to the controller. If the validation fails, the user will be redirected back to the form with the error messages and the input data.

Summary:

This is just a basic example of how you can create a Data validation middleware in Laravel. You can customize it to suit your needs by adding more validation rules, changing the error handling, or adding other functionality.

Must Read: What is middle Middleware and how to use Middleware in Laravel Framework?