Sort object by keys (JavaScript)

sortObjectByKeys.js

function sortObjectByKeys(obj, recursive = false) {
  const keys = Object.keys(obj).sort();

  let sorted_obj = {};
  keys.forEach(key => {
    sorted_obj[key] = obj[key];

    if (recursive && isObject(sorted_obj[key])) {
      sorted_obj[key] = sortObjectByKeys(sorted_obj[key]);
    }
  });

  return sorted_obj;
}