The Firebase Blog: Introducing Cloud Functions for Firebase

Today we are excited to announce the beta launch of Cloud Functions for Firebase. It lets you write small pieces of JavaScript, deploy them to Google's Cloud infrastructure, and execute them in response to events from throughout the Firebase ecosystem. This has been the most requested feature since Firebase launched. The ability to extend and connect Firebase features using Cloud Functions makes Firebase more powerful, allowing you to do even more with your app without having to think about servers.