nodejs and socket.io with lua server developement

Need some advice on building server with lua written code and nodejs & socket.io. I heard that lua is faster so I would like to write server in lua. and websockets with socket.io. In my basic idea luvit, nodelua,etc.. are lua modules for nodejs.

Now I need to know which module is best for building server with lua ,nodejs and socket.io?

remember I would use mongodb for data storage.

suggest me a suitable module!

thanks in advance.