Check if user exist in firebase

hello everyone
can i know how to check when i make registration user - if a user exist in firebase or no and prevent to overwrite!!! the user is 500

Call tag Users, when got data if username exists in list show notification if not add data to firebase

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Can you put sample

Something like this:


It looks like you need to do some learning and research about using AppInventor and Firebase:

for AppInventor:

A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook App Inventor 2 Book: Create Your Own Android Apps ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here Course In A Box and the aia files for the projects in the book are here: App Inventor 2 Book: Create Your Own Android Apps
How to do a lot of basic things with App Inventor are described here: How do you...? .

Also do the tutorials to learn the basics of App Inventor, then try something and follow the Top 5 Tips: How to learn App Inventor


Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by icon24 Taifun.

and for Firebase:


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