Even though people are questioning the purpose of this project, I think it could be useful for those who are prototyping things and don't want to tie themselves down to a specific database like MongoDB... not that there's anything wrong with Mongo. My favorite feature about Jsonbox is the querying by fields in the JSON data.

I've been working on a similar project, although not optimized specifically for JSON, but rather a generic key-value store with a focus on server-side scripting: https://kvdb.io

It seems like a lot of these storage as a service offerings have been popping up over the past few years because there's something about Mongo/Dynamo/etc. that could be simplified even further. I don't quite know what it is, but it feels like developer ergonomics (i.e., API) and ease of deployment (i.e., nothing to manage) are the big ones.