Socket.io custom client ID

Question

I\'m making a chat app with socket.io, and I\'d like to use my custom client id, instead of the default ones (8411473621394412707, 1120516437992682114

Answer 1

This will work with 2.2.0 and above version of Socket.IO

To set custom Socket Id, generateId function must be overwritten.

A simple example:

Server Side

var app = require('express')();
var http = require('http').Server(app);
var io = require('socket.io')(http);

io.use((socket, next) => {
  io.engine.generateId = () => {
    // USE ONE OF THESE
    socket.handshake.query.CustomId; // this work for me
    // return socket.handshake.query.CustomId;
  }
  next(null, true);
});

io.on('connection', function (socket) {
    console.log(socket.id);
})

Clint Side

io.connect(URL, { query: "CustomId = CUSTOM ID IS HERE" })

NOTE: *It must be in mind that socket id must be a unique value.