How to modify and test npm module changes locally

Options

Just change the code locally in node_modules, then restart the app. This is the fastest way to quickly verify if a change would work as expected.
Then you want something more permanent. When you have made the change in a proper module folder (not under node_modules), you can run npm pack in that folder which will generate a tar file you should be able to npm install directly from local

TODO:

Try using npm pack locally when messing with an npm package so we can simulate installing it locally from local (creates a tarball we can install)