Firebase: how to generate a unique numeric ID for key?

Question

I need numeric IDs for human readability. How do I get it in Firebase?

I want numeric ID for keys, e.g. \"000000001\", \"000000002\",\"00000003\",\"00000004\".

Answer 1

https://firebase.google.com/docs/firestore/manage-data/transactions

Use transactions and keep a number in the database somewhere that you can increase by one. This way you can get a nice numeric and simple id.