Node.js Modules System

In Node.js, every file is treated as a module. This allows you to organize your code into small, reusable pieces.

CommonJS (CJS)

This is the traditional way Node.js handles modules.

// Exporting
module.exports = { sayHello: () => console.log("Hello!") };

// Importing
const myModule = require("./myModule");
myModule.sayHello();

The modern JavaScript standard.

// Exporting
export const sayHello = () => console.log("Hello!");

// Importing
import { sayHello } from "./myModule.js";
sayHello();

[!TIP] Use .mjs extension or set "type": "module" in package.json to use ES Modules by default.