Web Programming: Back-end Development (Node.js, Django, Ruby on Rails)

What is Back-end Development?

Back-end development is the part of web development that handles server, database, and application logic management, ensuring that information flows correctly between the client and server.

Main Back-end Technologies

• Node.js: JavaScript runtime based on Google Chrome's V8 engine, ideal for real-time applications and scalable APIs.
• Django: Python framework that follows the "batteries included" principle, providing integrated tools for rapid development. Sure.
• Ruby on Rails: A Ruby framework that facilitates agile development with configuration conventions and intuitive syntax.

Example of a Node.js Server

This code shows how to create a basic web server with Express in Node.js:

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

// Define a GET route for the root path
app.get('/', (req, res) => {
    res.send('Hello, World from Node.js!');
});

// Start the server on port 3000
app.listen(3000, () => {
    console.log('Server running at http://localhost:3000');
});

Node.js allows you to create efficient and scalable servers with JavaScript.

Example Server in Django

This code shows how to define a simple view in Django:

from django.http import HttpResponse

def greeting(request):
    return HttpResponse("Hello, World from Django!")

Django provides a secure and structured environment for web development.

Example Server in Ruby on Rails

This code shows how to define a route in Ruby on Rails:

class GreetingController < ApplicationController
  def index
    render plain: "Hello, World from Ruby on Rails!"
  end
end

Rails allows you to develop web applications quickly with predefined conventions.

Conclusion

Node.js, Django, and Ruby on Rails are powerful tools for back-end development. The choice of framework depends on the project's needs and the developer's experience.