First of all:

• Make sure your current directory is where most of your projects are. For example: projects/angular or projects/gatsby .
• Use caution, this process is irreversible!
• These scripts are tested on Windows 10 with cmder.

Run this to see which folders will be deleted:

FOR /d /r . %d in (node_modules) DO @IF EXIST "%d" echo %d"

And then to actually delete them, just run this:

FOR /d /r . %d in (node_modules) DO @IF EXIST "%d" rm -rf "%d"

THERE IS NO RIGHT OR WRONG BUT ONLY THE RIGHT APPROACH BASED ON THE CONTEXT

@lucamezzalira