Server Side development with Node.js and Koa.js Quick Start Guide

Connecting to the database

We will define our MongoDB connection in a ./db.js file. This will help keep our index.js file neat and allow us to keep our configurations modular.

To connect to our database, if you haven't already, create a db.js file in the root directory as given:

touch db.js

Then, insert the following into the file:

// ./db.jsconst mongoose = require('mongoose');module.exports = () => {  mongoose.connect(    'mongodb://localhost:27017/koa-blog',    { useNewUrlParser: true }  );  const db = mongoose.connection;  db.on('error', error => {    throw new Error(`error connecting to db: ${error}`);  });  db.once('open', () => console.log('database connected'));};

In the preceding code block, first, we require the mongoose ODM library, then we export ...