It took me an embarrassingly long time to figure this out. When you include jQuery, change the script tag to a secured link. This fixed all my problems because jQuery wouldn't load in Chrome, making the jQuery we wrote before the body useless.
https://code.jquery.com/jquery-2.1.4.min.js
Edit: I'd like to add, I was following this tutorial on cloud9. Get requests are done with https, meaning I needed jQuery included using https. So this may not apply to those connecting via localhost:3000