node.js - command to find the number of connections in mongodb

Question

I have a requirement ti find the number of connections in mongodb. I used the command below to find that

db.serverStatus().connections

It gave me the output as below

{ "current" : 3, "available" : 19997 }

I have say 4 individual dbs in the mongodb,how do i find the connection status for the individual dbs rather than the whole list.I am stuck here any help will be much helpful