Use Javascript to access a variable passed through Twig

Question

I have a controller that passes an array to a twig template, which I want to use in a script written on that page. How would I go about doing that?

I\'ve tried this

Answer 1

In My Controller I Install SerializerBundle

$serializer = $this->get('serializer');
        $countries = $this->getDoctrine()->getRepository("QSCORBundle:CountryMaps")->findAll();
        $jsonCountries = $serializer->serialize($countries, 'json');
 return $this->render('QSCORBundle:Default:index.html.twig',array("countries"=> $jsonCountries));

And In My File Twig