This is the backend server-side application for the "Online Book Review Application" project, which is part of the "Back-end Application Development with Node.js and Express" course on edX by IBM.

In this project, you will assume the role of a back-end developer working for an online retailer that sells books. Your primary task is to develop a server-side application that stores, retrieves, and manages book ratings and reviews. This application will be used to provide various features for users, including:

• Retrieving a list of all books available in the bookshop
• Searching for specific books and retrieving their details based on the book's ISBN code, author names, and titles
• Retrieving reviews and comments for specified books
• User registration
• User login
• Adding a new review for a book (for logged-in users only)
• Modifying a book review (for logged-in users, but they can only modify their own reviews)
• Deleting a book review (for logged-in users, but they can only delete their own reviews)
• Allowing multiple users to access the application simultaneously to view and manage different book reviews simultaneously

This project involves developing a RESTful web service using Node.js and Express.js. A front-end developer in your team is working on the web-based client-side application that will communicate with this server-side application using REST.

To start working on this project, follow these steps:

1. Fork the skeleton code repository into your own GitHub account.
2. Clone the forked repository locally into your development environment.
3. Install the necessary dependencies by running npm install in the project directory.

The project structure includes several directories and files:

• controllers/: This directory contains the route handlers for different API endpoints.

• models/: Here, you define the data models used in the application.

• routes/: This directory holds the route definitions for the various API endpoints.

• tests/: You can write your tests in this directory using a testing framework like Mocha and Chai.

• utils/: This directory contains utility functions or modules that can be used throughout the project.

• app.js: The main application file where you configure and start the Express server.

Following are the features as HTTP methods in the Express server:

• Retrieve a list of all books.
• Search for books based on ISBN code, author names, and titles.
• Retrieve reviews/comments for specified books.
• User registration.
• User login.
• Adding a new review for a book (logged-in users only).
• Modifying a book review (logged-in users can modify only their own reviews).
• Deleting a book review (logged-in users can delete only their own reviews).

You will also implement Session and JWT (JSON Web Token) authentication to ensure that certain operations are accessible only to logged-in users.

To improve the user experience, you should enhance your code using Promises, Callbacks, or Async/Await functions to allow multiple users to interact with the application simultaneously. This ensures that users do not have to wait for each other's operations to complete.

implemented features are thoroughly tested using tools like Postman and write unit tests for your code using a testing framework.