$ sudo npm install png-js
$ sudo npm install -g png-js

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

$ sudo npm update png-js

Update package globally,

$ npm install -g png-js

Git clone:

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

$ sudo  npm install -g ./png-js

png-js@0.1.1 /usr/lib/node_modules/png-js

How to remove png-js package :

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

$ sudo npm uninstall png-js

Basic Information of png-js NPM Package: