Valet Ticketing Application 🚙🅿🎫

You can view details about this application here. This document only discusses the backend implementation for the application.

Backend Implementation 👩‍💻

I decided to make the backend as a REST API, implemented using Node.js and Express. The database that I used in the first version was MySQL but I switched to MongoDB in this version due to its flexibility - which was suitable for this case. For the ticket propagation, I decided to use Twilio SMS API.

App Structure 📂

The backend app has been split into various logically related parts, to practice separation of concerns. The express application uses middleware for related endpoints. The app contains the following parts/modules:

• auth: contains an AuthController which acts as middleware for authentication related endpoints. There is also a TokenCheck module available which is for validating tokens sent by the client (authorization)
• db: contains a module which deals with database connection
• error: contains a module which acts as a generic error handler. It is used as error handling middleware in the whole application
• qrcode: contains the QrCodeController which groups together endpoints for generating qrcode for ticket verification
• ticket: contains a module which groups together the endpoint for generating a valet ticket, as well as the functionality for sending out text messages
• user: contains a User file which defines the structure for a user object (to be stored in the db), i.e it defines a schema for usage with mongooge. There is also a UserController which acts as middleware for all endpoints related to the user actions
• valet: contains a Valet file which defines the structure for a valet object (to be stored in the db), i.e it defines a schema for usage with mongooge. There is also a ValetController which acts as middleware for all endpoints related to the valet

REST API Testing 🌧️

Endpoints exposed in the REST API were tested using Postman Client.

Backend Deployment ☁️

The backend is deployed on Heroku cloud.