Validating a JSON string with the json_validate PHP function

Published on 2024-08-21 • Modified on 2024-08-21

This snippet shows how to validate a JSON string with the json_validate() PHP function. This function was introduced in PHP 8.3 and finally allows developers to avoid calling the json_decode() function twice.

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<?php

declare(strict_types=1);

namespace App\Controller\Snippet;

/**
 * I am using a PHP trait to isolate each snippet in a file.
 * This code should be called from a Symfony controller extending AbstractController (as of Symfony 4.2)
 * or Symfony\Bundle\FrameworkBundle\Controller\Controller (Symfony <= 4.1).
 * Services are injected in the main controller constructor.
 */
trait Snippet315Trait
{
    public function snippet315(): void
    {
        $strings = [
            '{foo: bar}', // invalid: key and value not quoted
            '{"foo": "bar"}',
        ];

        foreach ($strings as $string) {
            echo $string.' '.(json_validate($string) ? '✅' : '❌').PHP_EOL;
        }

        // That's it! 😁
    }
}

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