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React & Node.js Programs

🔷 1. React Counter App (Functional Component) ✅ Question: Create a counter app using functional components in React. 💻 Solution: import React, { useState } from "react";function Counter() { const [count, setCount] = useState(0); return ( <div style={{ textAlign: "center" }}> <h2>Counter App</h2> <h3>{count}</h3> <button onClick={() => set...


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Create and Configure a Custom 500 Error Page

🎯 Objective To create a custom 500 error page for server-side errors. ❗ What is 500 Error? 500 error occurs when: Server crashes Code error occurs Internal server issue 📄 Step 1: Create Template templates/500.html <!DOCTYPE html><html><head> <title>Server Error</title></head><body> <h1>500 Error</h1> <p>Something w...


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Create and Configure a Custom 404 Error Page

🎯 Objective To create a custom 404 error page when a user visits a non-existing URL. ❗ What is 404 Error? 404 error occurs when: Page not found Invalid URL entered 📄 Step 1: Create Template Create file: templates/404.html <!DOCTYPE html><html><head> <title>Page Not Found</title></head><body> <h1>404 Error</h1> <p>O...


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Implement CRUD Operations Using Django Class-Based Views

🎯 Objective To implement Create, Read, Update, Delete (CRUD) operations using Django Class-Based Views (CBVs) for better structure and code reusability. 📌 What are Class-Based Views? Class-Based Views (CBVs) are an alternative to function-based views. They provide: Reusable code Less duplication Built-in functionality for CRUD 📦 Step 1: Model (Student) # models.pyfrom djan...


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Authentication with Django – Login and Logout

📌 Introduction After user registration, the next step is authentication: login logout restricting access to certain pages Django provides built-in functions for this: authenticate() login() logout() @login_required 🎯 Program Statement 👉 Implement login, logout, and protected page using authentication. 🧠 Concept This program uses: Django authentication system session manag...


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