arduino websocket serial project

JavaScript/adruino-temp-sensor/index.js

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+const SerialPort = require('serialport');
+const parsers = SerialPort.parsers;
+const fs = require('fs');
+let express = require('express');  
+let app = express();  
+let server = require('http').createServer(app);  
+let io = require('socket.io')(server);
+/* COMMUNICATION WITH ARDUINO AND CLENSING OF DATA */
+
+let lastHour = []
+let temperature;
+const parser = new parsers.Readline({
+    delimiter: '\r\n'
+});
+  
+const port = new SerialPort('COM3', {
+    baudRate: 115200
+});
+
+port.pipe(parser);
+
+port.on('open', () => {
+    console.log('Serial connection on COM3 initialized')
+});
+
+port.on('data', (data) => {
+    let temp = parseFloat(data.toString());
+    if (temp == NaN) return;
+    if (temp == NaN) return;
+    if (temp == undefined) return;
+    if (temp == null) return;
+    if (temp + 5 < temperature) return;
+    if (temp - 5 > temperature) return;
+    temperature = temp;
+});
+
+/* SIMPLE WEBSERVER */
+
+app.use('/', express.static(__dirname + '/client'));  
+app.get('/', function(req, res) {  
+    res.sendFile(__dirname + '/client/index.html');
+});
+app.listen(8080);
+console.log('Server listening on 80')
+
+/* WEBSOCKETS */
+
+server.listen(8081);
+
+io.on('connection', (socket) => {  
+    let ip = socket.request.connection.remoteAddress;
+    if (ip.startsWith('::ffff:')) ip = ip.substring(7);
+
+    socket.on('handshake', function(data) {
+        console.log('New client connecting at ' + ip)
+        socket.emit('handshake', 'server');
+    });
+
+    socket.on('ready', function(data) {
+        console.log('Handshake with ' + ip + ' successful')
+        socket.emit('lasthour', lastHour);
+
+        setInterval(() => {
+            socket.emit('temp', temperature);
+        }, 60000);
+    });
+});
+
+setInterval(() => {
+    lastHour.push(temperature);
+    if (lastHour.length > 60) lastHour.splice(0,1);
+}, 60000)