Using JSONP with FosRestBundle

json_call.js

(function($, undefined) {
  var requests = {
    getJsonAction : 'http://remote.domain.com/json/?callback=?' // Note the callback = ?, this automagically makes a function
  };
  
  // The function which handles the response
  var responseHandler = function(data){
    // Do something with the data
    // ...
  };
  
  $(function(){
    // JSON call to server
    $.getJSON(requests.getJsonAction, {
      'additional' : 'parameters'
    }, responseHandler);
  });
}(jQuery));

JsonController.php

<?php
namespace Demo\Bundle\Controller;
use FOS\RestBundle\Controller\FOSRestController;
use Symfony\Component\HttpFoundation\JsonResponse; // Helper added in Symfony 2.1 for JSON responses

class JsonController extends FOSRestController
{
 public function getJsonAction()
 {
   $data = array(
    //... 
    );
   
   $callback = $this->getRequest()->get('callback'); // Check to see if callback parameter is in URL
   $response = new JsonResponse(); // Construct a new JSON response
   if (isset($callback))
      $response->setCallback($callback);  // Set callback function to variable passed in callback
   $response->setData($data);
   
   return $response;
 }
}