How to check user is online or not Websocket?

Question

Node.js

When connecting, I assign an id to each user
ws.onclient=userId;
. How can I check if the user is online or not? If not online return for example not online.

wss.clients.forEach(function each(client) {
                       if (client.onclient === userId) {
                           console.log('Онлаин')
                       }
                   });

Answer 1

Client event listener: network, batch activity, UI timers in batches.