$ sudo npm install uglify-js
$ sudo npm install -g uglify-js

If want to update the uglify-js package execute the command as below,

$ sudo npm update uglify-js

Update package globally,

$ npm install -g uglify-js

Git clone:

$ sudo  git clone https://github.com/rektide/uglify-js.git

$ sudo  npm install -g ./uglify-js

uglify-js@3.1.10 /usr/lib/node_modules/uglify-js

How to remove uglify-js package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall uglify-js

Basic Information of uglify-js NPM Package: