{
  "-L8BpxbS70KYrZMQUF0W": {
    "createdAt": "2018-03-22T16:33:57+08:00",
    "email": "ss@ss.ss",
    "name": "ss"
  },
  "-KYrZMQUF0WL8BpxbS70": {
     // etc.
   }
}

[{
  id: '-L8BpxbS70KYrZMQUF0W
  createdAt: "2018-03-22T16:33:57+08:00",
  email: "ss@ss.ss",
  name: "ss"
}, {
  id: -KYrZMQUF0WL8BpxbS70"
  // etc.
}]

Object.keys(idBasedObjects).forEach(key => {
    console.log(resp[key])
  })