Firebase functions are the solution for database triggers and many more server-related executions. Instead of hosting a server, which listens to Firebase database changes and then fires the notification, we shall utilize one of the Firebase technologies to complete this task. Firebase functions has an efficient control on all the Firebase technologies, such as Firebase authentication, storage, analytics, and so on. Firebase functions can be used in various aspects; for example, when your analytic cohorts meet some milestone, you can send targeted notifications, invites, and so on. Any server level business logic that you might want to implement in your Firebase system has been made with Firebase functions. We will use Firebase functions for sending push notifications whenever a database trigger occurs. We need an entry level JavaScript understanding to complete this task.

To get started on Firebase functions, we need Node.js environment that you can install it from https...