We all have a lot of unfinished projects that are laying around and taking useful storage space, and we also know that the folder node_modules is the most heavy thing in the universe.
Now, the installation part.
We will install it globaly so we can run it from everywhere
npm install -g npkill
Then go to your projects directory for example and open a terminal window and run
npkill will scan and find all the node_modules and list them, you can navigate them with the arrow keys, to delete a node_modules folder just press the space bar, and you're done.
I saved around 15gb just by doing this.