Validation
Laravel 8
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ValidationException in Laravel - Handling Validation Errors
This exception is thrown when form validation fails, typically when using the validate() method or Form Requests.
The Error
Error Message
The given data was invalid - ValidationExceptionCommon Causes
- 1 Form data doesn't meet validation rules
- 2 Required fields missing from request
- 3 Invalid data format or type
- 4 API not handling validation response properly
Solutions
1
Display validation errors in Blade
Blade
@if ($errors->any())
<div class="alert alert-danger">
<ul>
@foreach ($errors->all() as $error)
<li>{{ $error }}</li>
@endforeach
</ul>
</div>
@endif
2
Show field-specific errors
Blade
<input type="text" name="email" value="{{ old('email') }}">
@error('email')
<span class="text-red-500">{{ $message }}</span>
@enderror
3
Handle validation in API responses
JavaScript
// Laravel automatically returns 422 with errors for API requests
// In your frontend:
axios.post('/api/users', data)
.catch(error => {
if (error.response.status === 422) {
console.log(error.response.data.errors);
}
});
4
Customize validation messages
PHP
$request->validate([
'email' => 'required|email|unique:users',
], [
'email.required' => 'We need your email address.',
'email.unique' => 'This email is already registered.',
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