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How do you handle HTTP request validation in Slim Framework? - Code Stap
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How do you handle HTTP request validation in Slim Framework?

How do you handle HTTP request validation in Slim Framework?

To handle HTTP request validation in Slim Framework with minimal steps, you can use the Respect/Validation library. Here’s how to do it:

1. Install Respect/Validation

Run the following command to install the package:

Example

composer require respect/validation

2. Define Validation Logic in Route

In your Slim route, validate request data using Respect/Validation:

Example

<?php
use Respect\Validation\Validator as v;
use Slim\Exception\HttpBadRequestException;

$app->post('/register', function ($request, $response, $args) {
    // Get parsed body data
    $data = $request->getParsedBody();

    // Define validation rules
    $usernameValidator = v::alnum()->noWhitespace()->length(3, 15);
    $emailValidator = v::email();

    // Validate request data
    try {
        $usernameValidator->assert($data['username']);
        $emailValidator->assert($data['email']);
    } catch (\Respect\Validation\Exceptions\NestedValidationException $exception) {
        return $response->withJson(['errors' => $exception->getMessages()], 400);
    }

    // Success response
    return $response->withJson(['message' => 'User registered successfully!']);
});
?>

3. Minimal Error Handling

If validation fails, the validation exception messages are returned as a JSON response with a 400 status code:

Example

{
  "errors": [
    "username must be alphanumeric",
    "email must be a valid email address"
  ]
}

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