Sample WebSocket server

server.js

const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 25595 });

wss.on('connection', function connection(ws, req) {
	var timer;
	var firstMessageSent = false;
	var areYouSureAsked = false;
	const ip = req.socket.remoteAddress;
	
	console.time(ip + " stayed for");
	
	ws.send("Welcome friend!");
	console.log(ip + " connected.");
	
	ws.on('message', function incoming(message) {
		if(!firstMessageSent && message.toLowerCase() !== "yes" && message.toLowerCase() !== "no") {
			firstMessageSent = true;
		}
		if(firstMessageSent) {
			if(message.toLowerCase() == "yes") {
				if(!areYouSureAsked) {
					ws.send("Wow! This mean I can hear you!");
				} else {
					ws.send("How come :c I'm pretty sure you said it!");
					areYouSureAsked = false;
				}
			} else if(message.toLowerCase() == "no") {
				if(!areYouSureAsked) {
					ws.send("Are you sure??! ;o");
					areYouSureAsked = true;
				} else {
					ws.send("Ikr! I know you said it.");
					areYouSureAsked = false;
				}
			} else {
				ws.send("Did you just say '" + message + "' ?");
			}
		} else {
			if(message.toLowerCase() == "yes") {
				ws.send("You can't say 'yes' yet o.o");
			}
			if(message.toLowerCase() == "no") {
				ws.send("You can't say 'no' yet o.o");
			}
		}
		if(message.toLowerCase() == "bye") {
			ws.send("Bye Bye!");
			ws.terminate();
		}
		console.log('Received: %s', message);
	});
	
	ws.on('close', function close(code, reason) {
		console.log(ip + " disconnected.");
		clearInterval(timer);
		console.timeEnd(ip + " stayed for");
	});
	
	setTimeout(function() {
		ws.send("Try answering with 'yes' or 'no' when you are asked whether you said something or not.");
	}, 4000);
	
	timer = setInterval(function() {
		console.log(ip + " is still connected...");
	}, 5000);
});