OJM 
Check if site is down through
isup.com
Packges like is-github-down or is-down check if site is down fetching status code from your location.
Which is unreliable since site might be available but blocked for your IP.
Whereas this tool checks it through awesome isup.com service which uses google servers around the world
Install
$ npm install --global ojm
Usage
$ ojm <website>