JsonDecodeTwigExtension.php

<?php

namespace App\Twig\Extension;

use Twig\Extension\AbstractExtension;
use Twig\TwigFilter;

/**
 * Class JsonDecodeTwigExtension.
 */
class JsonDecodeTwigExtension extends AbstractExtension
{
    /**
     * @return array
     */
    public function getFilters()
    {
        return [
            new TwigFilter('json_decode', [$this, 'jsonDecode']),
        ];
    }

    /**
     * @param string $input
     * @param bool $assoc
     *
     * @return string
     */
    public function jsonDecode($input, $assoc = false)
    {
        return json_decode($input, $assoc);
    }
}