I’m on a roll today. Since I have written posts about installing npm packages globally and locally, it was only logical to write posts about uninstalling.
There is an official npm inc. video about uninstalling local npm packages and one about uninstalling global npm packages. This video is about uninstalling local packages.
Uninstalling local packages (docs.npmjs.com)
How to modify System Integrity Protection in El Capitan: (In case you have software hindered by it) Glenn Fleishman,September 30, 2015, MacWorld
El Capitan’s System Integrity Protection will shift utilities’ functions: Glenn Fleishman, July 15, 2015, MacWorld