How do you extract most recently put data from mongDB using Node.JS

I am using this code but somehow the database returns the oldest entry only.

return db.collection("tags").find({$query:{id :inp}}).sort({$natural: 
   -1}).limit(1).next(function(err,result){
            console.log(result);
            if(err) throw err;
            console.log("sending 1 record");
            return res.jsonp(result);

via SmridhMalhotra