app.get('/', (req, res) => {
  res.send('Hello World!')
})

cd books-api
npm init -y
npm install expressLoyiha strukturasini yarating:
books-api/
|-- index.js
|-- routes/
|   |-- books.js
|-- controllers/
|   |-- bookController.js
|-- models/
|   |-- book.js✅ 4. Kod yozish4.1 index.js (asosiy fayl):const express = require('express');
const app = express();
const bookRoutes = require('./routes/books');

app.use(express.json());
app.use('/api/books', bookRoutes);

app.listen(3000, () => {
  console.log('Server running on port 3000');
});4.2 models/book.jslet books = [
  { id: 1, title: 'Clean Code', author: 'Robert C. Martin' },
];
module.exports = books;4.3 controllers/bookController.jsconst books = require('../models/book');

exports.getBooks = (req, res) => {
  res.json(books);
};

exports.getBookById = (req, res) => {
  const book = books.find(b => b.id === parseInt(req.params.id));
  if (!book) return res.status(404).send('Book not found');
  res.json(book);
};

exports.createBook = (req, res) => {
  const newBook = {
    id: books.length + 1,
    title: req.body.title,
    author: req.body.author,
  };
  books.push(newBook);
  res.status(201).json(newBook);
};

exports.deleteBook = (req, res) => {
  const index = books.findIndex(b => b.id === parseInt(req.params.id));
  if (index === -1) return res.status(404).send('Book not found');
  const deleted = books.splice(index, 1);
  res.json(deleted);
};4.4 routes/books.jsconst express = require('express');
const router = express.Router();
const bookController = require('../controllers/bookController');

router.get('/', bookController.getBooks);
router.get('/:id', bookController.getBookById);
router.post('/', bookController.createBook);
router.delete('/:id', bookController.deleteBook);