Creating directories in Node.js enables dynamic folder structure generation, build automation, and file organization through the built-in filesystem module methods. As the creator of CoreUI, a widely used open-source UI library, I’ve implemented directory creation in countless Node.js applications for build systems, project scaffolding, and automated file organization. From my expertise, the most effective approach is using fs.mkdir() with recursive options and proper error handling for nested directory structures. This method provides reliable directory creation with support for complex folder hierarchies and permission management.