Node.js Internal Modules

The fs module is one of the most used. It provides both synchronous and asynchronous methods. In a high-concurrency server, always prefer the asynchronous versions like fs.readFile to keep the Event Loop free.

With http.createServer(), you can spin up a web server in just a few lines of code. It gives you full control over the request and response objects, which is the foundation for frameworks like Express.

Building cross-platform apps requires careful path handling. path.join() and path.resolve() ensure your code works on Windows, Linux, and macOS without manual string manipulation.

Node.js is event-driven. Many core modules (like http and fs streams) inherit from EventEmitter. You can also create your own custom events to decouple your application logic.