Task: Setting Up the Server with Express, Listening on Port 8000, and Creating Book Routes

---

Step 1: Project Initialization

1. Create Project Folder: Start by creating a new folder for the project, such as node-express-server.
2. Initialize Node.js Project: In the terminal, run npm init -y to initialize a Node project and create a package.json file.
3. Install Express: Run npm install express to add Express to the project.
4. Create index.js File: This will be your main entry point.

Step 2: Set Up Basic Express Server

1. Import Express: In index.js, import the Express module.
2. Create Express App: Use const app = express(); to initialize the Express app.
3. Set Up a Port: Define a constant, const PORT = 8000;, to store the port number.
4. Listen on Port: Use app.listen(PORT, () => {...}); to make the server listen on port 8000, logging a confirmation message.

Step 3: Create Book Data

1. Create a Mock Book Array: Define a simple array, const books = [...], containing sample book objects. Each book should have an id, title, and author.

   const books = [
     { id: 1, title: 'Book One', author: 'Author One' },
     { id: 2, title: 'Book Two', author: 'Author Two' },
   ];

Step 4: Set Up GET Route to Fetch All Books

1. Define a Route: Use app.get('/books', (req, res) => {...}); to create a route for fetching all books.
2. Send Book Data: In the route handler, use res.json(books); to send the entire array of books as JSON.

Step 5: Set Up GET Route to Fetch a Book by ID

1. Use Path Parameter: Define a route with a path parameter using app.get('/books/:id', (req, res) => {...});.
2. Retrieve Book ID: Extract the id from req.params.
3. Find Book: Use books.find() to search for the book by id.
4. Handle Not Found: If no book is found, send a 404 response with a relevant message.
5. Return Book: If the book exists, send it in the response.

Step 6: Set Up POST Route to Add a New Book

1. Use Middleware: Add app.use(express.json()); to parse JSON bodies.
2. Define POST Route: Use app.post('/books', (req, res) => {...}); for adding a new book.
3. Receive Book Data: Access the new book data from req.body.
4. Generate New ID: Set an ID by incrementing the last book’s ID or using a random method.
5. Add Book to Array: Push the new book into the books array.
6. Send Success Response: Respond with the updated book list or a success message.

Step 7: Set Up DELETE Route to Remove a Book by ID

1. Define DELETE Route: Use app.delete('/books/:id', (req, res) => {...});.
2. Retrieve Book ID: Extract id from req.params.
3. Find and Remove Book: Use books.filter() to exclude the book with the matching id.
4. Check Deletion: If no book was deleted, send a 404 response.
5. Send Confirmation: Return a success message indicating the book was deleted, or send the updated book list.

Step 8: Test the Routes

1. Start the Server: Run node index.js and check for the confirmation message.
2. Use Postman or cURL: Demonstrate how to test each route using Postman or cURL:
   • GET /books
   • GET /books/:id
   • POST /books
   • DELETE /books/:id

---

This step-by-step breakdown will guide your students through setting up and testing a basic Express server with routes for managing a collection of books. Let me know if you'd like to add any advanced steps!