$ sudo npm install decimal.js
$ sudo npm install -g decimal.js

If want to update the decimal.js package execute the command as below,

$ sudo npm update decimal.js

Update package globally,

$ npm install -g decimal.js

Git clone:

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

$ sudo  npm install -g ./decimal.js

decimal.js@7.3.0 /usr/lib/node_modules/decimal.js

How to remove decimal.js package :

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

$ sudo npm uninstall decimal.js

Basic Information of decimal.js NPM Package: