How Can I Decode JSON in Twig Templates?

Decoding JSON in Twig

Decoding JSON in Twig templates is possible through a custom extension. Here's how:

Creating the Extension:

namespace Acme\DemoBundle\Twig\Extension;

use Symfony\Component\DependencyInjection\ContainerInterface;  
use \Twig_Extension;

class VarsExtension extends Twig_Extension
{
    protected $container;
 
    public function __construct(ContainerInterface $container) 
    {
        $this->container = $container;
    }
      
    public function getName() 
    {
        return 'some.extension';
    }
    
    public function getFilters() {
        return array(
            'json_decode'   => new \Twig_Filter_Method($this, 'jsonDecode'),
        );
    }

    public function jsonDecode($str) {
        return json_decode($str);
    }
}

Registering the Extension:

In your Services.xml file, register the extension:

<service>

Using the Extension in Twig:

To use the extension in your Twig templates:

{% set obj = form_label(category) | json_decode %}

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