This section is for macOS and Linux users. If you are on Windows, I have written a separate section for you.
The first thing we'll do is to download and set up MongoDB, as this will be the database we will use. We'll be using a third-party service to host our database when we eventually deploy it to Heroku, but on our local machine we'll need to download MongoDB so that we can start up a database server. This will let us connect to it via our Node applications to read and write data.
In order to grab the database, we'll head over to mongodb.com. Then we can go to the Download page and download the appropriate version.
On this page, scroll down and select Community Server; this is the one ...
