Create a custom API for Users data and add different endpoints in express server to perform CRUD operations on the API. Test the endpoints using POSTMAN.

const express = require('express');
const app = express();
const port = 3000;

// Middleware to parse JSON bodies
app.use(express.json());

// In-memory storage for users (as a mock database)
let users = [
  { id: 1, name: 'Alice', age: 30, email: 'alice@example.com' },
  { id: 2, name: 'Bob', age: 25, email: 'bob@example.com' }
];

// GET all users
app.get('/users', (req, res) => {
  res.json(users);
});

// GET user by ID
app.get('/users/:id', (req, res) => {
  const user = users.find(u => u.id === parseInt(req.params.id));
  if (!user) return res.status(404).send('User not found');
  res.json(user);
});

// POST a new user
app.post('/users', (req, res) => {
  const { name, age, email } = req.body;

  // Simple validation
  if (!name || !age || !email) {
    return res.status(400).send('Please provide name, age, and email');
  }

  const newUser = {
    id: users.length + 1,
    name,
    age,
    email
  };
  users.push(newUser);
  res.status(201).json(newUser);
});

// PUT update user by ID
app.put('/users/:id', (req, res) => {
  const user = users.find(u => u.id === parseInt(req.params.id));
  if (!user) return res.status(404).send('User not found');

  const { name, age, email } = req.body;

  // Update user fields
  user.name = name || user.name;
  user.age = age || user.age;
  user.email = email || user.email;

  res.json(user);
});

// DELETE user by ID
app.delete('/users/:id', (req, res) => {
  const userIndex = users.findIndex(u => u.id === parseInt(req.params.id));
  if (userIndex === -1) return res.status(404).send('User not found');

  const deletedUser = users.splice(userIndex, 1);
  res.json(deletedUser[0]);
});

// Start the server
app.listen(port, () => {
  console.log(`Server running at http://localhost:${port}`);
});


index.js
----------
const express = require('express');
const fetch = require('node-fetch');
const app = express();
const port = 3000;

app.set('view engine', 'ejs');
app.set('views', __dirname + '/views');

// Route to fetch users and render table
app.get('/users', async (req, res) => {
  try {
    const response = await fetch('https://jsonplaceholder.typicode.com/users');
    const users = await response.json();
    res.render('users', { users });
  } catch (err) {
    res.status(500).send('Failed to fetch data');
  }
});

app.listen(port, () => {
  console.log(`Server is running on http://localhost:${port}`);
});