nightwatch.json

{
  "src_folders" : ["./tests"],
 "custom_commands_path" : "",
 "custom_assertions_path" : "",
 "globals_path" : "",

 "selenium" : {
   "start_process" : true,
   "server_path" : "node_modules/selenium-server/lib/runner/selenium-server-standalone-2.45.0.jar",
   "log_path" : "",
   "host" : "127.0.0.1",
   "port" : 4444,
   "cli_args" : {
     "webdriver.chrome.driver" : "",
     "webdriver.ie.driver" : ""
   }
 },

 "test_settings" : {
   "default" : {
     "launch_url" : "http://localhost",
     "selenium_port"  : 4444,
     "selenium_host"  : "localhost",
     "silent": true,
     "screenshots" : {
       "enabled" : false,
       "path" : ""
     },
     "desiredCapabilities": {
       "browserName": "firefox",
       "javascriptEnabled": true,
       "acceptSslCerts": true
     }
   },

   "chrome" : {
     "desiredCapabilities": {
       "browserName": "chrome",
       "javascriptEnabled": true,
       "acceptSslCerts": true
     }
   }
 }
}