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🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!)

🎉 Day 46 — React Mastery Completed (Final Summary & Congratulations!) Congratulations, developer! 👏 You’ve successfully completed the 45-Day React.js Roadmap — from understanding the fundamentals to mastering advanced concepts like Redux, Routing, Testing, and Deployment. 📘 What You’ve Learned ✅ React basics — Components, JSX, Props, and State ✅ Hooks — useState, useEffect, useRef, useMemo, and Custom Hooks ✅ Context API and Redux Toolkit for global state management ✅ Routing with React Router & Protected Routes ✅ Data fetching using Fetch API, Axios, React Query ✅ Advanced Patterns — Compound Components, Render Props, HOCs ✅ Styling — CSS Modules, Styled Components, Theming ✅ Animations, Accessibility, Testing, and Performance Optimization ✅ Deployment on Vercel, Netlify, or GitHub Pages 🧩 Final Project Ideas Now that you’re done, build real-world apps to polish your skills: 📝 Task ...
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🔐 Day 41 — Security Best Practices for React Apps

🔐 Day 41 — Security Best Practices for React Apps

Security is a critical aspect of every web application. In this lesson, we’ll explore common security risks in React apps and how to mitigate them effectively. From protecting against XSS (Cross-Site Scripting) to securing your API keys and setting up Content Security Policy (CSP), we’ll cover it all.

🚫 1. Avoid Directly Injecting HTML

The dangerouslySetInnerHTML prop can expose your app to XSS attacks if used carelessly. 

<div dangerouslySetInnerHTML={{ __html: userInput }} />

✅ Instead, sanitize inputs before rendering using libraries like DOMPurify: 

import DOMPurify from 'dompurify';

<div dangerouslySetInnerHTML={{ __html: DOMPurify.sanitize(userInput) }} />

🔒 2. Hide API Keys and Secrets

Never expose API keys in frontend code. Store them in environment variables: 

// .env
REACT_APP_API_URL=https://api.example.com

Access it in your code safely:

const apiUrl = process.env.REACT_APP_API_URL;

🧱 3. Implement Content Security Policy (CSP)

CSP helps prevent injection attacks. Add a meta tag in public/index.html: 

<meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline';" />

🧩 4. Use HTTPS Always

Ensure your app is served via HTTPS to encrypt data between client and server.

💡 5. Validate Inputs on Backend Too

Even if you sanitize on the frontend, always validate and sanitize data on the server. Defense in depth is key!

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