Firebase has two databases, but neither of them has a concept called folders. Realtime Database (which I think you are referring to) has nodes, while Firestore has collections/documents.

In neither database there is an option to rename/move a node. The options is always to:

1. Read the data from its old location
2. Write it to its new location
3. Delete it from the old location.

In both Realtime Database and Firestore, you can do these operations in a single operation either as a transaction or as a multi-path update.

I recommend reading these previous questions on renaming/moving data:

• Realtime Database
• Firestore