JavaScript filesystem database

I couldn’t resist and, after many conversations with Mário Valente, I challenged myself to build a complete JavaScript filesystem based database from scratch. In short, something like CouchDB but written in JavaScript and using a filesystem approach for document storage.

Some characteristics of this new database system:

• fully written in JavaScript: nodeJS is my choice for its architecture and portability;
• every document must contain only JSON data;
• every document can be manipulated on the filesystem: the idea is to allow someone to edit a document using vim, for instance, without breaking anything. It also lets you easily backup, move or replicate your data without creating a heavy load on the database;
• the underlying filesystem can be changed: changing the underlying filesystem offers numerous possibilities, like easy distribution (using OpenAFS, XTREEMFS or others), replication (using finefs or others), and even attaching different backends (using FUSE, for example);
• the system must be available through an HTTP REST interface: this makes it very easy to immediately integrate the system into any existing applications. Bonus points if the API is compatible with CouchDB;
• queries must be performed using a MapReduce approach: this should make it very easy to perform queries on a large dataset.

So, right now I’m half way through it. I managed to write the backend and I’m on my way to the HTTP REST interface. I’ll create a github repo after I have something functional that can be easily built and tested.

What do you think of a system like this? Any features you’d like to add or change?