This is a simple backend created for a course selling website (or any e-commerce website for that matter) built using Node, Express and MongoDB. The backend provides endpoints (or routes) to Admin and User panels.

• Admins can sign-in and create courses.
• Users can sign-in, view courses and purchase courses.

This can serve as the starter code for any web application with similar structure and use cases. Some real world examples are:

• Amazon (for listing, selling and buying products)
• Udemy or Coursera

1. POST "/admin/signup"

   • Description: Creates a new admin account.
   • Input Body: JSON object => {username: "admin username", password: "any password"}
   • Response: JSON object =>
     • If admin doesn't exist: {message: "Admin Created Successfully"}
     • If admin exists: {message: "Admin Already Exists. Sign In Please"}

2. POST "/admin/signin"

   • Description: Checks for the desired admin account and signs in.
   • Input Body: JSON object => {username: "admin username", password: "any password"}
   • Response: JSON object =>
     • If admin exists: {token: "token created by JWT"}
     • If admin doesn't exist: {message: "Admin Account not found in the database. Please Sign Up."}

3. POST "/admin/courses"

   • Description: Creates a new course if the user is signed in.
   • Input Header: String => Authorization: "JWT recieved when admin had signed in"
   • Input Body: JSON object => { title: 'course title', description: 'course description', price: 100, imageLink: 'link to the thumbnail' }
   • Response: JSON object => {message: "Course created successfully", courseId: "Course-ID"}

4. GET "/admin/courses"

   • Description: Lists all courses of the current signed-in Admin.
   • Input Header: String => Authorization: "JWT recieved when admin had signed in"
   • Response: JSON object => {admin: "Admin Username", courses: List of Courses with their details}

1. POST "/user/signup"

   • Description: Creates a new user account.
   • Input Body: JSON object => {username: "user username", password: "any password"}
   • Response: JSON object =>
     • If user doesn't exist: {message: "User Created Successfully"}
     • If user exists: {message: "User Already Exists. Sign In Please"}

2. POST "/user/signin"

   • Description: Checks for the desired user account and signs in.
   • Input Body: JSON object => {username: "user username", password: "any password"}
   • Response: JSON object =>
     • If user exists: {token: "token created by JWT"}
     • If user doesn't exist: {message: "User Account not found in the database. Please Sign Up."}

3. GET "/user/courses"

   • Description: Lists all the available course to the client.
   • Input Header: String => Authorization: "JWT recieved when user had signed in"
   • Response: JSON object => {courses: Array containing all the courses with details}

4. POST "/user/courses/:courseId"

   • Description: Purchases the specified course and adds it to user's account.
   • Input Header: String => Authorization: "JWT recieved when admin had signed in"
   • Response: JSON object =>
     • If course exists: {message: "Course purchased successfully", courseId: "Course-ID"}
     • If course doesn't exist: {message: "Course not found"}

5. GET "/user/purchasedCourses"

   • Description: Lists all courses purchased by the current signed-in User.
   • Input Header: String => Authorization: "JWT recieved when user had signed in"
   • Response: JSON object => {"Purchased Courses" : Array containing all the courses with details}

• Ensure that you have Node installed in your machine locally (if not, install from here) by running the following command

  node

• Clone the repository by running the following command

  git clone https://github.com/Abhijeet-Gautam5702/course_selling_website_backend.git

• Install the dependencies

  npm install

• Create your own MongoDB instance from the official website.
• Get the connection string or the database URL and use it in index.js file in db folder.
• Visit Postman or any other API-testing tool to test the endpoints.

• NodeJS
• ExpressJS
• JWT (JSON Web Tokens)
• MongoDB
• Mongoose