Mastering Validation in Laravel – A Beginner’s Guide

This content originally appeared on DEV Community and was authored by Rohit Dhiman

When you’re building a web application, one of the most important steps before storing data is making sure that it’s valid. You don’t want incomplete forms, incorrectly formatted emails, or malicious input sneaking into your database.

That’s where Laravel’s validation shines.
It’s simple, powerful, and built right into the framework.

In this guide, we’ll walk through:

• What validation is and why it matters
• How Laravel makes it simple
• Examples of common validation rules
• How to use both quick controller-based validation and cleaner Form Request validation

What is Validation?

Validation is the process of checking incoming user input against certain rules before you save it or use it.

Think of it as a security guard at the entrance of your app:

• Checks if all required fields are filled
• Ensures data formats are correct (like email addresses)
• Stops suspicious or harmful data
• Improves user experience by catching mistakes early

Why Use Laravel’s Validation?

Laravel gives you:

• Built-in validation rules like required, email, unique, min, max, etc.
• Automatic error messages when validation fails
• Simple syntax for quick use
• Customizable rules & messages for more control

Basic Example: Controller Validation

Here’s the quickest way to validate data directly in your controller:

public function store(Request $request)
{
    $request->validate([
        'name'  => 'required|string|max:255',
        'email' => 'required|email|unique:users,email',
        'age'   => 'nullable|integer|min:18'
    ]);

    // Validation passed, save the user
    User::create($request->all());

    return redirect()->back()->with('success', 'User registered successfully!');
}

How it works:

• $request->validate() checks the incoming request against the rules.
• If it fails → Laravel automatically redirects back and shows errors.
• If it passes → The rest of the method runs.

Using Form Request Validation

If you want cleaner controllers and reusable rules, Laravel has Form Request classes:

Step 1 – Create a Form Request:

php artisan make:request StoreUserRequest

Step 2 – Define Rules in the Class:

public function rules()
{
    return [
        'name'  => 'required|string|max:255',
        'email' => 'required|email|unique:users,email',
        'age'   => 'nullable|integer|min:18',
    ];
}

Step 3 – Use it in Your Controller:

public function store(StoreUserRequest $request)
{
    User::create($request->validated());
    return redirect()->back()->with('success', 'User registered successfully!');
}

Commonly Used Validation Rules

• required → Field must be filled
• email → Must be a valid email format
• min / max → Minimum or maximum length/number
• unique:table,column → No duplicates allowed
• nullable → Field can be empty, but must follow rules if filled

Tips for Beginners

• Start with controller-based validation for small apps.
• Switch to Form Request validation as your app grows.
• Customize error messages for a better user experience.
• Always validate server-side — client-side validation is just extra help, not a replacement.

Final Thoughts

Validation might feel like a small step, but it’s essential for building secure, reliable, and user-friendly Laravel applications.

The best part? Laravel makes it effortless.
Master this early in your journey, and you’ll save yourself a lot of debugging headaches later.

Have you tried Laravel’s validation in your projects yet? Share your experience below — I’d love to hear!

Tags:
#Laravel #PHP #WebDevelopment #Validation #BeginnerFriendly

This content originally appeared on DEV Community and was authored by Rohit Dhiman