qs.js

/* Converts an object into a key/value par with an optional prefix. Used for converting objects to a query string */
var qs = function(obj, prefix){
  var str = [];
  for (var p in obj) {
    var k = prefix ? prefix + "[" + p + "]" : p, 
        v = obj[p];
    str.push(angular.isObject(v) ? qs(v, k) : (k) + "=" + encodeURIComponent(v));
  }
  return str.join("&");
}