It is recommended that you are running node@v4 or above. If you are using v0.12 for some reason, note that newer versions of selenium-webdriver use ES6 features. You will need to make sure your node process is started with the harmony flag. In general, it's best to use node@v4 or newer.If you plan to run the wdb-spec.js test (it doesn't run by default), you will need to have an appropriate version of the selenium-standalone jar file on your system. Please see below for more information.