$ sudo npm install mqtt
$ sudo npm install -g mqtt

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

$ sudo npm update mqtt

Update package globally,

$ npm install -g mqtt

Git clone:

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

$ sudo  npm install -g ./mqtt

mqtt@2.14.0 /usr/lib/node_modules/mqtt

How to remove mqtt package :

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

$ sudo npm uninstall mqtt

Basic Information of mqtt NPM Package: