Create A New Node Project With npm init
New node projects can be started by running this in the directory you want to make the project in.
That will walk you through a set of questions and setup the package.json file.
The initialization asks for a license, I don't see how to tell it "None" so I just put in the default and then move it to None in the package.json file after it's created.
Install Jest with:
npm install --save-dev jest
Here's how to get started with jest: