How to display a list of users who are online on the site?

Question

JavaScript

Hello!
I make a chat on nodejs + socket, I use passportjs for authorization. Tell me how to implement the output of a list of unique users who have visited the site and are online. I need to take into account that the user can log in and out from different devices, thereby:

user = {};
socket.on('connect', function() {
    user++
});
socket.on('disconnect', function() {
    user--
});

does not work as desired.

Answer 1

Generate a custom token for each user and use it as a key to write to the users object. And as it turns out, remove it from there.