$ sudo npm install promisify-node
$ sudo npm install -g promisify-node

If want to update the promisify-node package execute the command as below,

$ sudo npm update promisify-node

Update package globally,

$ npm install -g promisify-node

Git clone:

$ sudo  git clone https://github.com/rektide/promisify-node.git

$ sudo  npm install -g ./promisify-node

promisify-node@0.4.0 /usr/lib/node_modules/promisify-node

How to remove promisify-node package :

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

$ sudo npm uninstall promisify-node

Basic Information of promisify-node NPM Package: