Using Firebase, How do I Check for Duplicate Username and Show Error When There Is?

Hi,

I have this code:


Screenshot 2025-02-05 182254

I want to check for duplicates of username only. How can I do that?

Can you help me?

Thanks

You would need to call back a taglist (which from your blocks should be all the usernames), then you can check the newly entered username against the existing list of usernames, and notify the new user that their chosen username is already in use, and to try another.

Sorry I am a beginner.

Do you mean the block "call Firebase DB1.GetTagList"? But it doesn't have any extension to it so I can put block into it.

And does that mean I should create a list?

Something like this:

Thanks a lot! That's very helpful. Thank you for the help.