Node JS & MongoDB - Post and Get images for iOS server api

I am doing a very basic server for an app I am working on to help me understand node js and mongodb as a server for my mobile app. I have followed a tutorial and got it working posting simple todos. But what I want to do next is post images along with the text in the POST request and retrieve them with the GET request as JSON. Below is the code that I have so far which successfully posts the todo name along with the created at date to the db.I am doing a very basic server for an app I am