How to break your code into organized, reusable pieces — and why it changes everything. Here's what my first JavaScript project looked like: one file, 500 lines, everything jammed together. Helper functions at the top, API calls in the middle, DOM manipulation at the bottom, and a dozen global variables floating around connecting it all. It worked. But the moment I needed to change something, I was scrolling up and down for ten minutes trying to find where that one function was. And when I accidentally named two variables the same thing? Silent bugs that took an hour to track down. This is the problem modules solve. Instead of one massive file, you split your code into smaller, focused files — each responsible for one thing. Then you import only what you need, where you need it. No scrolling, no naming conflicts, no chaos. In the ChaiCode Web Dev Cohort 2026, modules were the moment my code started looking like something a professional would write. Let me show you how they work. Why Are Modules Needed?…