Restarting applications is annoying. Everytime you want to see whats effects your new code has on your application, you have to do it. Nodemon is magical and fixes that. Nodemon is a package that allows your application to run forever! It restarts itself every time you change the code in your IDE.
To install nodemon do: npm install nodemon -g
This will install it so that you can use it with any application you make on that machine.
To use it, do: nodemon app.js
More information can be found here: https://www.npmjs.com/package/nodemon