Varun's Backend Engineering Interview

How to run

1. Clone the repository and in the same folder use npm i to install the packages
2. Set up an environment variable with name AdminEmail for a specific email that can be used as an admin or super user.
3. In the terminal, type nodemon start to run the code.

Assumptions

• I assumed that there has to be an order management system to be made where Admin can add Services which are then ordered by customers.
• Customer/user will add services they choose to buy in a cart where they see their total amount and service selected names.
• Admin can see all orders and add new services that are to be offered.
• For testing i have used to Postman on my local system to validate the working.

Technologies used

1. Nodejs
2. Expressjs
3. MongoDB

Routes

Login/Register

1. localhost:2000/register with POST Request
   • Use this to register new users.
   • Takes two fields email and password
2. localhost:2000/login with POST Request
   • Use this to login a user
   • Take two fields email and password

Services

1. localhost:2000/service/addservice with POST Request
   • Use this to add new services
   • Takes three fields name, cost and index
   • This is Admin specific feature. Use the same email for login as AdminEmail
2. localhost:2000/service/all with GET Request
   • Use this to view all the services currently present

Orders

1. localhost:2000/order/currentorder with POST Request
   • Use this to make new order
   • Takes one field serviceIndices as an array eg:[1,2,3] where elements of this array are the service index for a specific service.
   • Returns order object
2. localhost:2000/order/update/:id with POST Request
   • Use this to remove one service at a time from the current order
   • Takes one field serviceToRemove with the service index to be removed.
   • Takes order id as paramater
3. localhost:2000/order/delete/:id with DELETE Request
   • Use this to remove the whole order
   • Takes order id as paramater
4. localhost:2000/order/userOrders with GET Request
   • Returns the logged in user's orders
5. localhost:2000/order/all with GET Request
   • Returns orders from all users
   • Can only be used by Admin with AdminEmail

Basic Working

• New user registers and logins which set a user_id in the cookie.
• user_id is used to authenticate user implemented using middleware
• User can see all services, create new order, see all of their orders, update order, and delete order.
• Admin can add new services and see all orders.

Future Scope

There are alot of impprovements that can be made and are necesarry as well. Here are a few:

• Login/register should have password authentication, email verification, password encryption.
• Instead of having just one Admin user we can have multiple role based users having access to specific data and routes.
• More CRUD operations in the Order section can be added that will be more useful
• Error handling can be more precise and easy
• User validation through middleware should be added to be fool proof