Vaadin 14 Java integration of Google Sign in -webcomponent's Polymer3 version using Vaadin 14 in npm mode. https://github.com/GoogleWebComponents/google-signin To use this, you need Google Client Id, for instructions see: https://developers.google.com/identity/sign-in/web/sign-in (In short, you need to create an app in https://console.developers.google.com and get id from there, also if you want to use this in a real server, you need allow domain and prove that you own the domain, but in development at localhost, only the client id is enough) Vaadin 10 version of the component is here https://vaadin.com/directory/component/google-sign-in-component