app.js

// default imports
const express = require('express');
const app = express();

// other imports
const bodyParser = require('body-parser');
const connectDB = require('./database/connect');
require('dotenv').config();
const songs = require('./routes/songs');
const artists = require('./routes/artists');
// middleware
app.use(bodyParser.json());
app.use(function (req, res, next) {
	res.setHeader('Access-Control-Allow-Origin', '*');
	res.setHeader('Access-Control-Allow-Methods', 'GET, POST, PUT, DELETE');
	res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
	res.setHeader('Access-Control-Allow-Credentials', true);
	next();
});
app.use('/api/songs/', songs);
app.use('/api/artists/', artists);
// routes
app.get('/', (req, res) => {
	res.send('Root page');
});
app.all('*', (req, res) => {
	res.status(404).send('The resource does not exist');
});
// launch server
const port = 4000;

const start = async () => {
	try {
		await connectDB(process.env.MONGO_URI);
		app.listen(port, console.log(`server listening on port ${port}`));
	} catch (err) {
		console.error(err);
	}
};
start();