Automatically send notification to all the users whenever there is any change in firebase [closed]

Question

How do I notify all users when a change is made in firebase? I do not wish to do this manually.

Answer 1

You should use a Firebase Cloud Function tiggered by a Realtime Database trigger, see doc here. Have a look at one of the official Firebase samples for Cloud Functions:

This sample demonstrates how to send a Firebase Cloud Messaging (FCM) notification from a Realtime Database triggered Function. The sample also features a Web UI to experience the FCM notification.

https://github.com/firebase/functions-samples/tree/master/fcm-notifications

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If you prefer to send an email, look at the following sample:

https://github.com/firebase/functions-samples/tree/master/email-confirmation

This samples "shows how to send a confirmation emails to users who are subscribing/un-subscribing to a newsletter". It is triggered when a user write some data under as specific Real Time Database node. So it is very similar to your case: when new data is written under a given DB node, the mail is sent.

You can also adapt it in order to use Sengrid, with their library for node.js https://github.com/sendgrid/sendgrid-nodejs. It works very well and is also a recommended solution by Firebase.

In case you encounter difficulties when adapting one of these samples to your case, do not hesitate to share your code and ask for help.