When we want to allow our users using our API to insert or update data, we need to accept a request from a different HTTP verb. When inserting new data, the POST verb is the preferred method to accept data and know it's for an insert. Let's take a look at code that accepts a POST request and data along with the request, and inserts a record into our collection and returns the updated JSON. Insert the following block of code after the route you added previously for GET:

router.post('/', function(req, res) {
    // insert the new item into the collection (validate first)
    if(req.body.Id && req.body.Title && req.body.Director && req.body.Year && req.body.Rating) {
        json.push(req.body);
        res.json(json);
    } else {
        res.json(500, { error: 'There was an error!' });
    }
});

You can see the first thing we do in the POST function is check to make sure the required fields were submitted along with the...