app.js

var request = require('request');
var sendgrid = require('sendgrid')('YOUR sendgrid.com USERNAME', 'password');
 
var areaCode = 972;
var headers = { Cookie: 'YOUR www.google.com COOKIE HERE' };
var url = 'https://www.google.com/voice/setup/searchnew/?ac=' + areaCode + '&start=0&country=US';
 
request.get({ url: url, headers: headers }, function(error, response, body) {
    var json = JSON.parse(body);
    var message = 'Google Voice: There are ' + json.JSON.num_matches + ' numbers in area code ' + areaCode + ' available at this time.';
    
    if(json.JSON.num_matches > 0) {
        sendgrid.send({
            from: 'someone@example.com',
            subject: 'Google Voice',
            text: message,
            to: 'someone@example.com'
        }, function() {});
    }
});