> var msg = {};
undefined
> msg.payload = [ { "id": 2, "firstname": "cc", "lastname": "ll", "birthday": "0000-00-00", "salary": 2000 }, { "id": 3, "firstname": "cc", "lastname": "ll", "birthday": "0000-00-00", "salary": 7000 } ]
[ { id: 2,
    firstname: 'cc',
    lastname: 'll',
    birthday: '0000-00-00',
    salary: 2000 },
  { id: 3,
    firstname: 'cc',
    lastname: 'll',
    birthday: '0000-00-00',
    salary: 7000 } ]
> msg.payload[0]
{ id: 2,
  firstname: 'cc',
  lastname: 'll',
  birthday: '0000-00-00',
  salary: 2000 }
>