JavaScript Modules Explained: From Chaos to Clean Code

If you've ever opened a JavaScript file and found 3,000 lines of tangled functions, global variables clashing with each other, and no clear structure — you already understand why modules exist, even if you haven't used them yet. Modules are one of the most important concepts in modern JavaScript. They solve a fundamental problem: how do you split your code into organized, reusable, and maintainable pieces without everything falling apart? In this guide, we'll start from the problem modules solve