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

or you can override the socket id, like this:

io.on('connection', function(socket){

      socket.id = "YOUR_CUSTOM_ID";
});

you can see under the array:

io.sockets.sockets

Answer 2

Do not change the socket IDs to ones of your own choosing, it breaks the Socket.io room system entirely. It will fail silently and you'll have no clue why your clients aren't receiving the messages.

Answer 3

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.

Answer 4

With this 2.2.0 version of Socket.IO, you can achieve this.

io.use((socket, next) => {
  io.engine.generateId = () => socket.handshake.query.token;
  next(null, true);
});

Answer 5

I would use an object as a hash lookup - this will save you looping through an array

var clients = {};
clients[customId] = clientId;

var lookup = clients[customId];