RESTapi_demo/mongoConfig.js

require('dotenv').config({ path: 'development.env' });

const mongoose = require('mongoose');

mongoose.connect(
    process.env.MONGODB_URI,
    (err) => {
        if (err) return console.log("Error: ", err);
        console.log("MongoDB Connection -- Ready state is:", mongoose.connection.readyState);
    }
);