BrowserStack Node.js sample

var webdriver = require('browserstack-webdriver'),
	fs = require('fs');

// Input capabilities
var capabilities = {
  'browserName' : 'firefox', 
  'browserstack.user' : '<username>',
  'browserstack.key' : '<access_key>'
}

var driver = new webdriver.Builder().
  usingServer('http://hub.browserstack.com/wd/hub').
  withCapabilities(capabilities).
  build();
driver.session_.then(function(sessionData){
	//This sessionData contains BrowserStack Session ID.
  console.log("BrowserStack Session Id: " + sessionData.id_);
});
driver.get('http://www.google.com/ncr');
driver.findElement(webdriver.By.name('q')).sendKeys('BrowserStack');
driver.findElement(webdriver.By.name('btnG')).click();
driver.executeScript('return 2').then(function(return_value) {
  console.log('returned ', return_value)
  webdriver.WebDriver.prototype.saveScreenshot = function(filename) {
    return driver.takeScreenshot().then(function(data) {
        fs.writeFile(filename, data.replace(/^data:image\/png;base64,/,''), 'base64', function(err) {
            if(err) throw err;
        });
    })
	};
	driver.saveScreenshot('snapshot1.png');
});
driver.getTitle().then(function(title) {
  console.log(title);
});

driver.quit();