Nodejs socketio how to properly push?

Question

JavaScript

io.cookies = [];
io.parseCookies = function() {
console.log(this.cookies); // Возвращает [] в консоль
};
io.sockets.on('connection', function(socket) {
  socket.on('auth', function(msg) {
    var message = JSON.parse(msg);
    io.cookies.push({'id': socket.id, 'user_id': message.id});
    console.log(io.cookies); // Ничего не возвращает в консоль
    io.parseCookies();
  });
});

Actually a question. What am I doing wrong? And how to fix it.