Asynchronous REST server

Hii

I am developed REST server with meteor/node.js/mongoDB.
The server should provide GET/POST method using API (REST).

I would like to be sure that I write correctly the methods,
for the serve can function at maximum capacity in terms of synchronization with the Data Base(mongoDB), and a large number of requests in the same time.

here exmple of my code.

Thanks
Aviram.