index.js

const PORT=8080;

const express=require('express');
const app = express();
const path=require('path');
const router = express.Router();
const server = require('http').Server(app);
const io = require('socket.io')(server);
const fs = require('fs').promises;

let CHAT_DB = [];
app.set("views", "./views");
app.set("view engine", "ejs");

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.use('/chat', router);
app.get("/chat", (req, res) => {
    res.render('../views/layout.ejs', { 
        title: "Chat vintage 🎮",
        message: CHAT_DB
       });
});

io.on('connection', (socket) => {

    socket.on('cliente-mensaje', async (message) => {
        io.emit('server-mensaje', message)
        let messageFile = {
            email: message.email,
            timestamp: message.timestamp,
            mensaje: message.mensaje
        }
        CHAT_DB.push(messageFile)
        console.log("Mensajes totales back")
        console.log(CHAT_DB)
        try {
            await fs.writeFile(`messages.txt`, JSON.stringify(CHAT_DB))
		} catch(err) {
			console.log('Error en la escritura del archivo ❌', err.error)
		}
    })
})

app.use(express.static('public'))


app.get('*', (req, res) =>{
    res.sendFile(path.resolve('public/404.html'));
});

const srv = server.listen(PORT, () => {
    console.log(`Servidor http escuchando en el puerto ${server.address().port}`)
})

srv.on("error", error => console.log(`Error en servidor ${error}`))