$ sudo npm install graphviz
$ sudo npm install -g graphviz

If want to update the graphviz package execute the command as below,

$ sudo npm update graphviz

Update package globally,

$ npm install -g graphviz

Git clone:

$ sudo  git clone https://github.com/rektide/graphviz.git

$ sudo  npm install -g ./graphviz

graphviz@0.0.8 /usr/lib/node_modules/graphviz

How to remove graphviz package :

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

$ sudo npm uninstall graphviz

Basic Information of graphviz NPM Package: