mongodb find in node js

var MongoClient = require('mongodb').MongoClient;
var ObjectId = require('mongodb').ObjectID;
var url = 'mongodb://localhost:27017/App';
var findUser = function (db, callback) {
var cursor = db.collection('users').find();
cursor.each(function (err, doc) {
if (doc != null) {
console.dir(doc);
} else {
callback();
}
});
};

MongoClient.connect(url, function (err, db) {
findUser(db, function () {
db.close();
});
});