Creating and Exporting Custom Modules in Node.js In large-scale applications, working with numerous custom-built modules is common. A module in Node.js is a small file containing reusable code such as functions, variables, or classes. To create a module, write the desired functionality (e.g., addition function) and export it using 'module.exports'. This allows importing these functionalities into other files for reuse by requiring the specific module path.
Exporting Functions, Variables, and Classes from Modules Node.js supports exporting multiple items like functions (e.g., add), variables (e.g., API key), or entire classes (e.g., Payment class). For instance: define methods within a class to handle tasks like payment processing; then export this class so its instances can be created elsewhere. Import these exports via require statements to utilize them across different parts of an application efficiently.