Alternate Storage Options for NodeJS

I need to implement a simple keystore for a nodejs application, for some environmental restrictions I can only use the built-in data storage solution, that is, I cannot use engines that work as a separate server / process (e.g. Mongodb, mysql, etc. )

For some corporate restrictions, I cannot use sqlite , which was the first option that came to mind.

I researched the following sqlite alternatives:

• leveldb ( https://code.google.com/p/leveldb/ )
• hamsterdb ( http://hamsterdb.com/ )

I have no experience with these engines, can anyone provide comments or suggestions on these? And, of course, any other alternative is very welcome for me.

Edit:

With further research, I discovered

• NEDB ( https://github.com/louischatriot/nedb )
• EJDB ( https://github.com/Softmotions/ejdb-node )

Which is more suitable for Nodejs.