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

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

$ sudo npm update viz.js

Update package globally,

$ npm install -g viz.js

Git clone:

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

$ sudo  npm install -g ./viz.js

viz.js@1.8.0 /usr/lib/node_modules/viz.js

How to remove viz.js package :

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

$ sudo npm uninstall viz.js

Basic Information of viz.js NPM Package: