What is Firebase using under the hood?

Question

I am planning to use a BaaS for a project, and am almost convinced to use Firebase.

The only thing I am wondering about it is what is it using as database?

I know that it is a noSQL database, storing element in JSON, a question on quora mentionned that Firebase once used MongoDB as it s database, but not anymore.

So my question is simply: What is Firebase is using under the hood to store it's data?

Answer 1

I was just poking around on the interwebz and found this, before read your question:

https://groups.google.com/forum/#!topic/firebase-talk/Doi4MP_A81k

2. The backend is proprietary. Since our data structure (a JSON-based tree) is pretty unique, it's pretty custom.

Hope it helps!