Check internet connection in Nodejs.

check-internet.js

'use strict';

const dns = require('dns').promises;

/**
 * Check connection to internet.
 *
 * @return {Promise<Boolean>} Whether there is connection to internet or not.
 */
exports.checkInternet = function checkInternet() {
    return dns.lookup('google.com')
        .then(() => true)
        .catch(() => false);
};