Creating a Module in Node.js

Overview

In Node.js, a module is a reusable block of code that encapsulates related functionality. You can create your own modules to organize your code better and promote code reusability.

Creating a Simple Module

To create a module, follow these steps:

1. Create a new JavaScript file for your module.
2. Export the functions or variables you want to expose.
3. Import the module in your main application file.

Example Module

Here's an example of creating a simple module called math.js that exports addition and subtraction functions:

// math.js
    function add(a, b) {
      return a + b;
    }
    
    function subtract(a, b) {
      return a - b;
    }
    
    // Export functions
    module.exports = { add, subtract };

Using the Module

Now, you can import and use the math.js module in another file:

// app.js
    const math = require('./math');
    
    console.log(math.add(5, 3));      // Output: 8
    console.log(math.subtract(5, 3)); // Output: 2