HTTP methods and CRUD mapping in Node.js - Mini Project: Build & Apply

HTTP Methods and CRUD Mapping in Node.js

📖 Scenario: You are building a simple Node.js server to handle user data. You want to connect HTTP methods to CRUD operations so your server can create, read, update, and delete users.

🎯 Goal: Build a basic Node.js server using the http module that maps HTTP methods GET, POST, PUT, and DELETE to CRUD operations on a simple in-memory user list.

📋 What You'll Learn

Create an array called users with three user names: 'Alice', 'Bob', and 'Charlie'

Create a variable called port and set it to 3000

Use http.createServer to create a server that listens for HTTP requests

Inside the server callback, use req.method to check the HTTP method and handle GET, POST, PUT, and DELETE accordingly

💡 Why This Matters

🌍 Real World

Web servers use HTTP methods to perform CRUD operations on data. Understanding this mapping helps build APIs that clients like browsers or apps can use to manage data.

💼 Career

Backend developers often create RESTful APIs that map HTTP methods to CRUD actions. This knowledge is essential for building web services and working with frameworks like Express.js or Fastify.

1

Create the initial user data array

Create an array called users with these exact strings: 'Alice', 'Bob', and 'Charlie'.

Node.js

# Your code here

Need a hint?

Use const users = ['Alice', 'Bob', 'Charlie']; to create the array.

2

Set the server port

Create a variable called port and set it to the number 3000.

Node.js

const users = ['Alice', 'Bob', 'Charlie'];
# Your code here

Need a hint?

Use const port = 3000; to set the port number.

3

Create the HTTP server with method checks

Use http.createServer to create a server. Inside the callback, use req.method to check for 'GET', 'POST', 'PUT', and 'DELETE' methods. For now, just write empty blocks for each method inside the callback function.

Node.js

const users = ['Alice', 'Bob', 'Charlie'];
const port = 3000;

// Your code here

Need a hint?

Use http.createServer((req, res) => { ... }) and inside check req.method with if and else if.

4

Complete the server to respond with user data and start listening

Inside the 'GET' block, respond with the JSON string of users. Inside the 'POST', 'PUT', and 'DELETE' blocks, respond with a simple text message like 'Create user', 'Update user', and 'Delete user' respectively. Finally, call server.listen(port) to start the server.

Node.js

const http = require('http');

const users = ['Alice', 'Bob', 'Charlie'];
const port = 3000;

const server = http.createServer((req, res) => {
    if (req.method === 'GET') {
        // Respond with users
    } else if (req.method === 'POST') {
        // Respond with create message
    } else if (req.method === 'PUT') {
        // Respond with update message
    } else if (req.method === 'DELETE') {
        // Respond with delete message
    } else {
        res.statusCode = 405;
        res.end('Method Not Allowed');
    }
});

// Your code here

Need a hint?

Use res.setHeader and res.end to send responses. Use server.listen(port) to start the server.