Show HN: Need feedback on my first Node.js application

Hi Hackers, Github URL : https://github.com/sunilkumarc/track-courier I'm working on a end to end web application to learn the technologies like Node.js(backend), Mocha/Chai(testing), Backbone.js(fronend) etc. A couple of APIs have been completed. I would love for feedbacks from experts so that I know my mistakes early in the development. What is track-courier? A web application to track couriers in real time. There will be two types of users 1) Admin: One who can update the status of a courier. 2) Normal: One who can check the status of his/her courier. What is completed now? I have completed Login, Signup and CRUD operations on couriers. Where I'm stuck? I'm not sure how to stub database calls, so that I can test my code against hard coded data. Regards, Sunil