Node.js

Node.js is a JavaScript runtime environment. It revolutionized the JavaScript world and made JavaScript the most popular development language among developers today (according to https://insights.stackoverflow.com/survey/2017#technology-programming-languages). The Node ecosystem is the largest in the world with over 600,000 packages and is managed by NPM, the default package manager.

The JHipster CLI is a NodeJS application and hence requires NodeJS, to run, and many of the tools used in the generated application will also require NodeJS:

1. Check for NodeJS by typing node -v in the Terminal. It should display a version number. Make sure that the version number is greater than 8.9 and corresponds to the latest LTS version of NodeJS.
2. If the command is not found or if you have a lower version of NodeJS then you can visit the Node.js website (https://nodejs.org/en/download/) and follow the instructions to install the latest LTS version available. Please note that non-LTS versions (current) might not be stable and it is advised not to use them. 
3. Once installed, check the command in step 1 again to make sure. As NodeJS alters the environment variables, you would have to open a new Terminal here.
4. NPM is automatically installed when you install NodeJS. You can check this by running npm -v in the Terminal.