How Can I Decode JSON Data Within My Twig Templates?

Decoding JSON in Twig

Decoding JSON in Twig is a useful technique when working with complex data structures in your Twig templates. Despite searching, you may have noticed a lack of information on this topic.

This is because Twig does not natively support JSON decoding. However, you can easily extend Twig's functionality to decode JSON data.

To decode JSON in Twig, let's create a custom 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);
    }
}

Next, register the extension in your Services.xml file:

<service>

Finally, you can use the extension in your Twig templates:

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

This will decode the JSON string in the form_label(category) variable into an object that you can use in your Twig template.

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