server.js

var requirejs = require('requirejs');
var config = require('./config.json');

// Create the server
const express = require('express')
const app = express()
const http = require('http')
const server = http.createServer(app)
const { Server } = require("socket.io")
const io = new Server(server)
var players = []; // Define the players variable

app.use(express.json());
app.use(express.static(__dirname + '/public'));

app.get('/', (req, res) => {
  res.sendFile(__dirname + '/index.html');
});

app.post('/', function(request, response, next){
	response.send(request.body);
});

// When someone connect, console.log()
io.on('connection', (socket) => {
  console.log('[+] A user is connected : ' + socket.id);
  // Set score to 0
  players[players.length] = {socketid : socket.id, score : 0};

  // A player disconnect
  socket.on('disconnect', () => {
    for (var i = 0; i < players.length; i++) {
      console.log( "[-] A user is disconnected : " + players[i].socketid);
      if(players[i].socketid === socket.id){
        // Send a message to all players with the ID
        io.emit('del', players[i].id);
        // Delete the player
        players.splice(i, 1);
      }
    }
  });

  // A player move his mouse
  socket.on('position', (msg) => {
    // Check if player exists to update data
    for (var i = 0; i < players.length; i++) {
      if(players.length > 0){
        if(players[i].socketid === socket.id){
          players[i].x = msg.x;
          players[i].y = msg.y;
          players[i].id = msg.id;
          players[i].username = msg.username;
          players[i].color = msg.color;
        }
      }
    }
    // Send the data to all players
    io.emit('move', players);
  });

  socket.on('score', (msg) => {
    for (var i = 0; i < players.length; i++) {
      if(players.length > 0){
        if(players[i].socketid === socket.id){
          players[i].score = msg.score;
        }
      }
    }
    io.emit('score', players);
  });

  // Send random coins to the players
  setInterval(() => {
    coin = {};
    // Random position
    coin.x = Math.floor(Math.random() * 500);
    coin.y = Math.floor(Math.random() * 500);
    coin = JSON.stringify(coin);
    console.log('[o] Coin send: ' + coin);
    io.emit('coin', coin);
}, config.coinSpawnIntervall);
});

// A console.log() on start and define the port
server.listen(3000, () => {
  console.clear(); // Clear console
  console.log('                           ');
  console.log('  ┌─────────────────────┐  ');
  console.log('  │      Started!       │  ');
  console.log('  │   localhost:3000    │  ');
  console.log('  └─────────────────────┘  ');
  console.log('                           ');
});