Firebase db tag list

hello dear community. there is not tag list block in firebase db? how can use this function?

thank you very much! your replies are life saver!

hello again. your answer works great with json lists which root nodes (tags) are known and i can get value with object block. but if i dont know root nodes? for example i have Users tag and user IDs under it, how can i get ID list?

I just had FB save another list. USERS/*theirUsername/"" (last part is just “” so when I call the tag USERS the data comes back like this {“username1”,"",“username2”,""} and so on. The tag results go into a list separated by , and then I parse the data into another list. I remove all of the { } " and that gives me all of my usernames to ensure they arent already taken. Hope that sorta helps.

İ will try this method, thank you very much