Laravel 9 Custom Validation Rules Example

Hi Guys,

In this example, I will learn you how to use custom validation rules in laravel 9. We will show laravel 9 custom validation rules example you can easily create custom validation rules in laravel 9. Validation is a primary requirement of every project, without validation we can not release a successful application or website. Because if you haven't implemented validation then you get the wrong information from use input. Laravel provides there are several default validation rules like required, max, min, array, unique, digits, in, boolean, before, after, etc. We can simply use those validation rules in laravel 9 application. But if you require to create your own custom validation like given value should be in uppercase or lowercase etc as we require.

Here, I will simply represent how to make custom validator rules in the laravel 9 application and it is very simple, so you have to just follow the below step, make sure you can create only for laravel 9.

we make example from scratch. In this example, I take the number text field and you can just enter an even number, If you enter the odd number then you got a validation error.

Step 1: Download Laravel

Let us begin the tutorial by installing a new laravel application. if you have already created the project, then skip following step.

composer create-project laravel/laravel example-app

Step 2: Add Custom Validation Rule

In the first step, we will create custom validation rules by run the following command. Bellow command through you can create Validation rules file and we can write a logic on that file. So let's run the below command.

php artisan make:rule CheckAgeRule

Next, after successfully run the above command, you will found new "rules" folder in the app directory. In the rules folder, you will also found CheckAgeRule.php file. We have to simply write logic there, if you enter an even number then return true otherwise don't do anything.

So, you should have file like as bellow:

app/Rules/CheckAgeRule.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class CheckAgeRule implements Rule
{
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        if ($value < 30) {
            return true;
        }
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'The :attribute must be less than 30.';
    }
}

Step 3: Add Route

Here, we need to add two routes for create form get method and another for the post method. so open your routes/web.php file and add the following route.

routes/web.php

<?php

use App\Http\Controllers\CustomValidationController;

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

Route::get('/custom-validation', [CustomValidationController::class, 'index'])->name('custom.validation.index');
Route::post('/custom-validation/store', [CustomValidationController::class, 'store'])->name('custom.validation.store');

Step 4: Add Controller

Here, now we should create a new controller as CustomValidationController. So run the below command and create a new controller. bellow controller for create a controller.

php artisan make:controller CustomValidationController

Next below the command, you will find a new file in this path app/Http/Controllers/CustomValidationController.php.

In this controller will create seven methods by default as below methods:

1)index()

2)store()

So, let's copy the below code and put it on the CustomValidationController.php file.

app/Http/Controllers/CustomValidationController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Rules\CheckAgeRule;

class CustomValidationController extends Controller
{
    /**
     * Write code on Method
     *
     * @return response()
     */
    public function index()
    {
        return view('customValidation');
    }

    /**
     * Write code on Method
     *
     * @return response()
     */
    public function store(Request $request)
    {
        $request->validate([
            'name' => 'required',
            'age' => [
                'required', 
                new CheckAgeRule()
            ]
        ]);

        dd("continue...");
    }
}

Step 5: Add Blade File

Finally at the end of this example, we have to create customValidation.blade.php file, in this file we will create form and display validation error so let's create customValidation.blade.php file and put bellow code:

resources/views/customValidation.blade.php

<!DOCTYPE html>
<html>
<head>
    <title>Laravel 9 Custom Validation</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.css" integrity="sha256-NuCn4IvuZXdBaFKJOAcsU2Q3ZpwbdFisd5dux4jkQ5w=" crossorigin="anonymous" />
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-md-6 offset-3 mt-5">
            <div class="card mt-5">
                <div class="card-header text-center bg-info">
                    <h2 class="text-white"> <strong>Custom Validation</strong></h2>
                </div>
                <div class="card-body">
                    @if (count($errors) > 0)
                        <ul class="alert alert-danger pl-5">
                            @foreach($errors->all() as $error)
                               <li>{{ $error }}</li> 
                            @endforeach
                        </ul>
                    @endif
                    <form action="{{ route('custom.validation.store') }}" method="post">
                        @csrf
                        <div class="form-group">
                            <label>Name</label>
                            <input type="text" name="name" class="form-control">
                        </div>
                        <div class="form-group">
                            <label>Age</label>
                            <input type="text" name="age" class="form-control">
                        </div>
                        <div class="text-center">
                            <button class="btn btn-success"><i class="fa fa-floppy-o" aria-hidden="true"></i> Save </button>
                        </div>
                    </form>
                </div>
            </div>
        </div>
    </div>
</div>
</body>
</html>

Run Laravel App:

All steps have been done, now you have to type the given command and hit enter to run the laravel app:

php artisan serve

Now, you have to open a web browser, type the given URL and view the app output:

http://localhost:8000/custom-validation

It will help you...