index.js

const express = require('express');
const app = express();
const http = require('http').createServer(app);
const io = require('socket.io')(http, {
    cors: {
        origin: 'http://localhost:3000',
        methods: ['GET', 'POST'],
        credentials: true
    }
});
const moment = require('moment');

app.use((req, res, next) => {
    res.setHeader('Access-Control-Allow-Origin', 'http://localhost:3000');
    next();
});

app.use(express.static('public')); // Serve static files from the 'public' directory

// json { "status": "", [ "timestamp": "", "username": "", "subreddit": "", "type": "", "body": "" ] }
const data = {
    status: "unread",
    timestamp: moment().format(),
    username: "Alice",
    subreddit: "r/aww",
    type: "comment",
    body: "This is a test comment"
};
const mess = {
    id: 1,
    sender: "Aliceooasods",
    subject: "Hello",
    message: "Hello, world!",
    timeSent: "2019-01-01T12:00:00"
};

app.post('/messages', (req, res) => {
    // Handle POST requests to '/messages' here
    console.log('Received a message:', req.body);
    res.sendStatus(200);
});

io.on('connection', (socket) => {
    console.log('A user connected!');

    setInterval(() => {
        socket.emit('receiveNotification', data);
        console.log('Notification sent to client!')
    }, 1000);
});

const port = process.env.PORT || 4000;
http.listen(port, () => {
    console.log(`Server listening on port ${port}`);
});