Node.js private chat system algorithm

Question

I use express, socket.io.

I have two user types

site visitors (Site users)
admins (site admins)

When visitors visit the site, i add user data(browser, location, ip..etc..) to VisitorObject and show the VisitorObject to admins.

When admins want to send message to a visitor, i should emit function of only user which the admin wants to type.

I don't want to use

io.sockets.emit('newMessage', message);

I want to use like this

io.sockets[id].emit('newMessage', message);

EDIT---

i am connection node.js server with

 var socket = io.connect('http://127.0.0.1:3000', {query: 'id=' + id});

This id is not a socket id, it is the user id. I don't want to use socket.id on send message. I want to use user id. Because socket.id always change for the tab of browser.

do you want to send message to specific socket (by socket id ) ? — David
– David, Commented Feb 8, 2018 at 11:12

David · Accepted Answer · 2018-02-08 11:36:27Z

try something like this

 // sending to individual socketid (private message) socket.to(<socketid>).emit('newMessage', message);

or

io.to(<socketid>).emit('newMessage', message);

https://socket.io/docs/emit-cheatsheet/

if you need to emit by user_id you can do this

socket.join(user_id); // when user connected

and than

io.to(user_id).emit('newMessage', message)

i'm sorry, i don't want to use socket.id. I want to use user id.

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