customer-feedback-service/database.js

var mongoose = require('mongoose');

var start = function() {
    return new Promise((resolve, reject) => {
        //Set up default mongoose connection
        var mongoDB = 'mongodb://127.0.0.1/kairoscope_dev';
        mongoose.connect(mongoDB, {useNewUrlParser: true, useUnifiedTopology: true}).then(
            () => { 
                /** ready to use. The `mongoose.connect()` promise resolves to mongoose instance. */ 
                console.log("Database connected");
                resolve();
            },
            err => { 
                /** handle initial connection error */ 
                console.log("Error connecting to database");
                reject(err);
            }
        );
    });
}

module.exports.start = start;