semhoun/slim-request-validation

A Slim middleware for HTTP request validation based on Respect/Validation

1.5.0 2026-04-10 07:56 UTC

Requires

• php: ^8.5
• psr/http-message: ^1.1 || ^2.0
• respect/validation: ^3.1
• slim/psr7: ^1.7 || ^2.0

Requires (Dev)

• php-di/php-di: ^7.1
• phpunit/phpunit: ^12.0 || ^13.0
• slim/slim: ^4.15

GPL-2.0-or-later

• Benycode
• Nathanaël SEMHOUN

• framework
• validator
• validation
• middleware
• request
• slim

README

A Request validation library for the Slim 4 Framework. It uses the respect/validation library.

This repository is a fork of https://github.com/benycode/slim-request-validation.

Table of contents

• Install
• Compatibility
• Usage
• Testing

Install

Via Composer

$ composer require semhoun/slim-request-validation

Requires PHP 8.5+ and Slim 4.

Compatibility

• PHP: ^8.5
• Slim Framework: ^4.15
• respect/validation: ^3.1
• slim/psr7: ^1.7 || ^2.0
• phpunit/phpunit for development: ^12.0 || ^13.0

Usage

Create a Rule class:

use BenyCode\Slim\Validation\Rule\RequestValidationRuleInterface;
use Respect\Validation\ValidatorBuilder as v;

final class AnyRuleClass implements RequestValidationRuleInterface
{
    public function rules(): array
    {
        return [
            'name' => v::alpha(),
            'url' => v::url(),
        ];
    }

    public function messages(): array
    {
        return [
            'url' => 'url must be a URL',
        ];
    }
}

With respect/validation 3.x, validators are built with Respect\Validation\ValidatorBuilder instead of the older static Validator API.

Add the middleware to a route:

use BenyCode\Slim\Validation\RequestValidation;
use BenyCode\Slim\Validation\Middleware\RequestValidationExceptionMiddleware;
use BenyCode\Slim\Validation\Transformer\RequestValidatorTransformFactory;
use BenyCode\Slim\Validation\Encoder\JsonEncoder;
use Slim\Factory\AppFactory;

$app = AppFactory::create();

$app->post('/api/any_end_point', function ($request, $response) {
    return $response;
})
    ->add(new RequestValidationExceptionMiddleware(new RequestValidatorTransformFactory(), new JsonEncoder()))
    ->add(new RequestValidation([
        new AnyRuleClass(),
    ]));

$app->run();

Keep your code clean and split rules across classes when needed:

use BenyCode\Slim\Validation\RequestValidation;
use BenyCode\Slim\Validation\Middleware\RequestValidationExceptionMiddleware;
use BenyCode\Slim\Validation\Transformer\RequestValidatorTransformFactory;
use BenyCode\Slim\Validation\Encoder\JsonEncoder;
use Slim\Factory\AppFactory;

$app = AppFactory::create();

$app->post('/api/any_end_point', function ($request, $response) {
    return $response;
})
    ->add(new RequestValidationExceptionMiddleware(new RequestValidatorTransformFactory(), new JsonEncoder()))
    ->add(new RequestValidation([
        new AnyRuleClass(),
        new AppendedRuleClass(),
        new AppendedRule2Class(),
        new AppendedRule3Class(),
    ]));

$app->post('/api/any_end_point2', function ($request, $response) {
    return $response;
})
    ->add(new RequestValidationExceptionMiddleware(new RequestValidatorTransformFactory(), new JsonEncoder()))
    ->add(new RequestValidation([
        new AnyRuleClass(),
        new AppendedRule3Class(),
    ]));

$app->run();

Testing

composer test