How should I learn Node.js modules?
In order: understand what modules are, learn require and module.exports, understand module caching, learn path resolution, handle circular dependencies, learn ES modules, and apply best practices like one concern per module and no side effects on require.
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More FAQs in A Roadmap to Mastering Node.js Modules
Understand that modules isolate code into files. Whatever you define in a file stays there unless you export it. This isolation is the core concept everything else builds on.
After you understand CommonJS, module caching, and path resolution. ES modules build on the same concepts but with different syntax and static analysis, so learning CommonJS first makes ES modules more meaningful.
Because it is surprising and causes real bugs. Modules run once and are cached, so requiring the same file twice returns the same object. Understanding this prevents bugs and lets you use caching for shared state like singletons.
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