🚀 Day 30 - Restarting My Full-Stack Journey Today was a very practical backend development day. Instead of focusing only on theory, I spent most of my time building APIs with Express.js and understanding how routing and middleware work behind the scenes. This was one of those days where concepts started feeling much more real because I could actually see requests moving through my application. 📚 What I learned today: ✅ Express Fundamentals * Creating Express applications * Understanding request and response objects * Working with JSON data using: app.use(express.json()) * Sending responses using: * `res.send()` * `res.json()` * `res.status()` * `res.redirect()` * `res.sendStatus()` ✅ Route Parameters & Query Parameters Worked with: /menu/:id and /search?q=biryani Understanding the difference between: * `req.params` * `req.query` ✅ HTTP Methods in Express Implemented: * GET * POST * PUT * PATCH * DELETE Built CRUD-style APIs and understood where each method should be used. ✅ Express Routing * Route handlers * Dynamic routes * Wildcard routes * Route chaining using: app.route() ✅ Middleware Deep Dive Learned how middleware works in Express: * Request logging middleware * Timing middleware * Authentication middleware * Authorization middleware Understanding: next() and why forgetting it can cause requests to hang forever. ✅ Authentication & Authorization Built custom middleware for: * Token validation * User identification * Role-based access control Understanding the difference between: * Authentication → Who are you? * Authorization → What are you allowed to do? 🛠️ Practical Work Built multiple Express applications that included: ✅ Basic Express Server ✅ Route Parameters ✅ Query Parameters ✅ CRUD Operations ✅ Request Logging ✅ Authentication Middleware ✅ Role-Based Authorization ✅ Custom Response Handling 💡 Biggest takeaway: Today made me realize that middleware is one of the most powerful concepts in backend development. Instead of writing the same code in every route, middleware allows us to handle logging, authentication, validation, and many other concerns in a clean and reusable way. Backend development is starting to feel much more structured and scalable now 🚀 #100DaysOfCode #FullStackDevelopment #BackendDevelopment #NodeJS #ExpressJS #JavaScript #APIs #Middleware #LearningInPublic #ChaiCode #DAY1 #DAY30 #100DaysOfSilence @Hiteshdotcom @piyushgarg_dev @yntpdotme @surajtwt_ @ChaiCodeHQ