Node.js with Sample Mock API

 Node.js with Sample : Mock API using express

const express = require('express');

const app = express();

const PORT = 3000;

// Mock data

const users = [

  { id: 1, name: 'John Doe', email: 'john.doe@example.com' },

  { id: 2, name: 'Jane Smith', email: 'jane.smith@example.com' },

  { id: 3, name: 'Sam Johnson', email: 'sam.johnson@example.com' },

];

// Middleware

app.use(express.json());

// Routes

// Get all users

app.get('/api/users', (req, res) => {

  res.status(200).json(users);

});

// Get user by ID

app.get('/api/users/:id', (req, res) => {

  const userId = parseInt(req.params.id, 10);

  const user = users.find(u => u.id === userId);

  if (user) {

    res.status(200).json(user);

  } else {

    res.status(404).json({ message: 'User not found' });

  }

});

// Add a new user

app.post('/api/users', (req, res) => {

  const { name, email } = req.body;

  const newUser = {

    id: users.length + 1,

    name,

    email,

  };

  users.push(newUser);

  res.status(201).json(newUser);

});

// Update a user by ID

app.put('/api/users/:id', (req, res) => {

  const userId = parseInt(req.params.id, 10);

  const userIndex = users.findIndex(u => u.id === userId);

  if (userIndex !== -1) {

    const { name, email } = req.body;

    users[userIndex] = { id: userId, name, email };

    res.status(200).json(users[userIndex]);

  } else {

    res.status(404).json({ message: 'User not found' });

  }

});

// Delete a user by ID

app.delete('/api/users/:id', (req, res) => {

  const userId = parseInt(req.params.id, 10);

  const userIndex = users.findIndex(u => u.id === userId);

  if (userIndex !== -1) {

    users.splice(userIndex, 1);

    res.status(204).send(); // No content

  } else {

    res.status(404).json({ message: 'User not found' });

  }

});

// Start the server

app.listen(PORT, () => {

  console.log(`Mock API is running at http://localhost:${PORT}`);

});