$ sudo npm install slack-client
$ sudo npm install -g slack-client

If want to update the slack-client package execute the command as below,

$ sudo npm update slack-client

Update package globally,

$ npm install -g slack-client

Git clone:

$ sudo  git clone https://github.com/rektide/slack-client.git

$ sudo  npm install -g ./slack-client

slack-client@2.0.6 /usr/lib/node_modules/slack-client

How to remove slack-client package :

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

$ sudo npm uninstall slack-client

Basic Information of slack-client NPM Package: