Day 26 of #100DaysOfCode — Modular Routing

When your backend server starts small, having all your routes inside a single app.js file feels simple and convenient. But as your application grows, more pages, more API endpoints, more middleware. It becomes harder to maintain. This is exactly where modular routing in Express.js shines. Day 26 was about how modular routing works, why it matters, and how it keeps your project clean and scalable. 🚩 The Problem: One Massive app.js If you don’t break routes into separate files, your main server file might look like this: // app.js app . get ( ' /users ' , ...) app . post ( ' /users ' , ...) app . get ( ' /products ' , ...) app . post ( ' /products ' , ...) // and eventually it becomes unmanageable... This gets messy fast—especially once middleware, controllers, authentication, or validation get added. ✅ The Solution: Modular Routing Modular routing lets you split related routes into separate files using the Express Router object . It keeps your project organized by grouping endpoints by