Convert JavaScript object to x-www-form-urlencoded format

JSON_to_URLEncoded.ts

const JSONtoURLEncoded = (element: any, key?: string, _list?: any[]) => {
  let list = _list || [];
  if (typeof element == "object") {
    for (let idx in element) JSONtoURLEncoded(element[idx], key ? key + "[" + idx + "]" : idx, list);
  } else {
    list.push(key + "=" + encodeURIComponent(element));
  }
  return list.join("&");
};

JSON_to_URLEncoded_TEST.ts

const data = {
  'users' : [
    {
      "id": 100,
      "name": "Stefano"
    },
    {
      "id": 200,
      "name": "Lucia"
    },
    {
      "id": 300,
      "name": "Franco"
    },
  ],  
  'time' : +new Date
};

console.log(
  JSON_to_URLEncoded(data)
);

/*
Output:

users[0][id]=100&users[0][name]=Stefano&users[1][id]=200&users[1][name]=Lucia&users[2][id]=300&users[2][name]=Franco&time=1405014230183

*/