Unable to return value from function Node.js

I am new to Node.js and I am unable to return a value from one of my functions.

My code looks like this:

//Instantiate MongoClient
var mongo = require('mongodb').MongoClient;
//Express engine
var express = require('express');
//Assert library (Perhaps overkill if you are writing production-level code)
var assert = require('assert');
//URL for my mongo instance
var db_url = 'mongodb://localhost:27017/pynap';
var url = require('url');

//Instantiate express
var router = express();


//Get operation
router.get('/:id', function(req, res, next) {
    var targetCollection = req.params.id.toUpperCase()
    var resultArray = [];
    console.log("Getting documents for collection: " + targetCollection);

    mongo.connect(db_url, function(err, db){
        assert.equal(null, err);
        var cursor = db.collection(targetCollection).find();

        var docCount = db.collection(targetCollection).count(function(err, result) {
            console.log("Number of results: " + result);
            if (result == 0) {
                res.render('empty', {collection: targetCollection});
            }
            return result;
        });

        // This should return `result` from the above function
        console.log(docCount);

        cursor.forEach(function(doc, err){
            assert.equal(null, err);
            resultArray.push(doc);
        }, function(){
            db.close();
            res.render('data', {
                results: resultArray
            });
        });
    });
});

module.exports = router;

I am trying to return result from one of my functions, so that the value gets assigned to docCount. When I print docCount I get the value undefined.

via rhillhouse