Firebase Realtime Database is a cloud-hosted NoSQL database. Data is stored as JSON and can be accessed in your Web, iOS, Android app using Google’s Firebase SDK. But, Google doesn’t provide such SDK for Apps Script. This library solves that problem. It gives you Firebase SDK for Apps Script.
Nice Google Apps Script library from Mani Doraisamy that makes it easy to read/write data from a Firebase Realtime Database. The site also highlights the performance gain of writing this library from the V8 runtime compared to the older FirebaseApp library shared by Romain Vialard. Mani’s code is open source and if you have issues, feedback or contributions you can add these via the Github repo.
Source: Firefast – Getting Started