server.js

const app = require('./app');
const mongoose = require('mongoose');
const config = require('./config/keys.config');

const start = async () => {
    try {
        await mongoose
            .connect(config.mongoURI, {
                useNewUrlParser: true,
                useUnifiedTopology: true,
                useCreateIndex: true,
                useFindAndModify: false,
            })
            .then(() =>
                console.log(
                    'MongoDB database has been successfully connected. Expecting server to start ... ',
                ),
            )
            .catch((error) =>
                console.log(
                    'Warning! An error occurred while connecting to the MongoDB database. Error: ' +
                        error,
                ),
            );

        app.listen(config.port, () => {
            console.log(`Server has been started on port ${config.port}...`);
        });
    } catch (error) {
        console.log(
            'Warning! An error occurred while starting the server. Error: ' + error.message,
        );
        process.exit(1);
    }
};

start();