Laravel 10 Custom Validation Rule Example Tutorial

Apr 14, 2023 . Admin

Hi dev,

I'll provide you with an example of a personalised validation rule in Laravel 10. If you want to see an instance of how to apply a unique validation rule in Laravel 10, you've come to the right spot. This post goes into great detail on the addition of a custom validation rule in Laravel 10. I want to show how to construct a unique validation rule in Laravel 10. So let's look at an illustration in greater detail.

Laravel provides default validation rules such as email, required, unique, date, and more. If you need to create a custom validation rule in Laravel, I can guide you through the steps.

For this example, we'll construct a special validation rule named BirthYearRule. Birth year will be added as an input text box, and we will utilise our unique validation to ensure that the user enters a year between 1980 and the present.

So, let's see the step by step validation:

Step 1: Install Laravel

This step is not required; however, if you have not created the laravel app, then you may go ahead and execute the below command:

composer create-project laravel/laravel example-app

Step 2: Create Routes

In this step, we will create two routes GET and POST for custom validation rule example. so let's add it.

routes/web.php

<?php
  
use Illuminate\Support\Facades\Route;
  
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, 'create']);
Route::post('custom-validation', [CustomValidationController::class, 'store'])->name('custom.validation.post');

Step 3: Create Validation Rule

In this step, we will create new "BirthYearRule" validation rule that will check user enter valid year. so let's run below command and update rule validation file.

php artisan make:rule BirthYearRule

app/Rules/BirthYearRule.php

<?php
  
namespace App\Rules;
  
use Closure;
use Illuminate\Contracts\Validation\ValidationRule;
  
class BirthYearRule implements ValidationRule
{
    /**
     * Run the validation rule.
     *
     * @param  \Closure(string): \Illuminate\Translation\PotentiallyTranslatedString  $fail
     */
    public function validate(string $attribute, mixed $value, Closure $fail): void
    {
        if(!($value >= 1980 && $value <= date('Y'))){
            $fail('The :attribute must be between 1980 to '.date('Y').'.');
        }
    }
}

Step 4: Create Controller

In this step, we have to create new controller as CustomValidationController and we have also need to add two methods create() and store() on that controller. We will use BirthYearRule validation on store method. so let's update follow code:

app/Http/Controllers/CustomValidationController.php

<?php
  
namespace App\Http\Controllers;
  
use Illuminate\Http\Request;
use Illuminate\View\View;
use Illuminate\Http\RedirectResponse;
use App\Rules\BirthYearRule;
   
class CustomValidationController extends Controller
{
    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function create(): View
    {
        return view('forms');
    }
        
    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request): RedirectResponse
    {
        $validatedData = $request->validate([
                'name' => 'required',
                'birth_year' => [
                    'required',
                    new BirthYearRule()
                ]
            ]);
        
        /*
            $validatedData['password'] = bcrypt($validatedData['password']);
            $user = User::create($validatedData);
        */
            
        return back()->with('success', 'User created successfully.');
    }
}

Step 6: Create View File

In Last step, let's create forms.blade.php(resources/views/forms.blade.php) for create form and put following code:

resources/views/forms.blade.php

<!DOCTYPE html>
<html>
<head>
    <title>Laravel Custom Validation Rule Example</title>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
    <div class="container">
      
        <h1>Laravel Custom Validation Rule Example</h1>
         
        <form method="POST" action="{{ route('custom.validation.post') }}">
        
            {{ csrf_field() }}
        
            <div class="mb-3">
                <label class="form-label" for="inputName">Name:</label>
                <input 
                    type="text" 
                    name="name" 
                    id="inputName"
                    class="form-control @error('name') is-invalid @enderror" 
                    placeholder="Name">
    
                @error('name')
                    <span class="text-danger">{{ $message }}</span>
                @enderror
            </div>
         
            <div class="mb-3">
                <label class="form-label" for="inputEmail">Birth Year:</label>
                <input 
                    type="text" 
                    name="birth_year" 
                    id="inputEmail"
                    class="form-control @error('birth_year') is-invalid @enderror" 
                    placeholder="Birth Year">
    
                @error('birth_year')
                    <span class="text-danger">{{ $message }}</span>
                @endif
            </div>
       
            <div class="mb-3">
                <button class="btn btn-success btn-submit">Submit</button>
            </div>
        </form>
    </div>
</body>
</html>

Run Laravel App:

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