Need help setting up multiplayer

Question: If someone could help me setup multiplayer/ for this game very much appreciated!

First and foremost you need a server.

Like a node.js with Express and (so change your template).

After that you create the server file to listen to player moviments and broadcast them.

io.on('connection', (socket) => {
    console.log('A user connected:',;
    socket.on('playerMovement', (data) => {
        socket.broadcast.emit('otherPlayerMovement', data);
    socket.on('disconnect', () => {
        console.log('User disconnected:',;

Doing that you connect your game client to the server (using and voilá.

const socket = io.connect('http://localhost:3000');

// For example, you need to emit player's movement to the server
function emitPlayerMovement() {
    socket.emit('playerMovement', player);

// And listen to movements of other players too
socket.on('otherPlayerMovement', (otherPlayer) => {
    // Don't forget to update the game state with otherPlayer data like
    player.x = otherPlayer.x;
    player.y = otherPlayer.y;

This is a base structure just to give you a idea about how to start, so you might need to add some things after to make it a enjoyable experiente for players.