Protractor configuration file using BrowserStack and multiple capabilities

browserstack-credentials.json

{
  "username": "your browserstack username",
  "key":      "your browserstack key"
}

protractor.browserstack.config.js

/**
 * @author      Christiaan Scheermeijer
 * @copyright   2015 Video Dock b.v.
 */

'use strict';

var fs = require('fs');

// read credentials file
var credentials = function() {
  var data = fs.readFileSync('browserstack-credentials.json', 'utf8');
  return JSON.parse(data);
}();

/**
 * You don't want to add the same properties to each capability
 */
var addCredentials = function (capability) {
  capability['browserstack.user'] = credentials.username;
  capability['browserstack.key'] = credentials.key;
  capability['browserstack.local'] = 'true';
  capability['project'] = 'Your project name';

  return capability;
};

exports.config = {

  // capabilities collection
  // http://www.browserstack.com/automate/capabilities
  multiCapabilities: [
    addCredentials({ 'browserName': 'Chrome', 'version': '37', 'os': 'OS X', 'os_version': 'Mountain Lion'}),
    addCredentials({ 'browserName': 'Chrome', 'version': '38', 'os': 'OS X', 'os_version': 'Mountain Lion'})
  ],

  // max parallel sessions
  maxSessions: 2,

  seleniumAddress: 'http://hub.browserstack.com/wd/hub',

  // your specs
  specs: [
    'specs/**/*'
  ]
};