how to get socket.id of a connection on client side?

Question

Im using the following code in index.js

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

Answer 1

For Socket 2.0.4 users

Client Side

 let socket = io.connect('http://localhost:'); 
 console.log(socket.id); // undefined
 socket.on('connect', () => {
    console.log(socket.id); // an alphanumeric id...
 });

Server Side

 const io = require('socket.io')().listen(portNumber);
 io.on('connection', function(socket){
    console.log(socket.id); // same respective alphanumeric id...
 }