server.js

//MONGODB PW: 9wAytpdXHGTQ94e
//MONGODB CONNECTION: mongodb+srv://Bartosz:<password>@cluster0.edbqm.mongodb.net/<dbname>?retryWrites=true&w=majority

const http = require('http');
const mongoose = require('mongoose');
const app = require('./app');

mongoose.connect('mongodb+srv://Bartosz:9wAytpdXHGTQ94e@cluster0.edbqm.mongodb.net/<dbname>?retryWrites=true&w=majority')
    .then(() => {
        console.log('Successfully connected to MongoDB Atlas!');
    })
    .catch((error) => {
        console.log('Unable to connect to MongoDB Atlas!');
        console.error(error)
    });

const normalizePort = val => {
    const port = parseInt(val, 10);

    if (isNaN(port)) {
        return val;
    }
    if (port >= 0) {
        return port;
    }
    return false
};
const port = normalizePort(process.env.port || '3000');
app.set('port', port);

const errorHandler = error => {
    if (error.syscall !== 'listen') {
        throw error;
    }
    const address = server.address();
    const bind = typeof address === 'string' ? 'pipe ' + address : 'port: ' + port;
    switch (error.code) {
        case 'EACCES':
            console.error(bind + ' requires elevated privileges');
            process.exit(1);
            break;
        case 'EADDRINUSE':
            console.error(bind + ' is already in use.');
            process.exit(1);
            break;
        default:
            throw error;
    }
};


const server = http.createServer(app);

server.on('error', errorHandler);
server.on('listening', () => {
    const address = server.address();
    const bind = typeof address === 'string' ? 'pipe ' + address : 'port ' + port;
    console.log('Listening on ' + bind);
})


server.listen(port);