How do I use CommonJS in Node.js?

How do I use CommonJS in Node.js?

CommonJS is a module format that allows you to include modules in your Node.js applications. You can use require() to import modules and module.exports to export them.

Can you give me an example of how to export a function using CommonJS?

Sure! Here's a simple example:

// myModule.js
function greet(name) {
    return `Hello, ${name}!`;
}

module.exports = greet;

And how do I import that function in another file?

You can import the function like this:

// app.js
const greet = require('./myModule');
console.log(greet('Alice')); // Output: Hello, Alice!

What if I want to export multiple functions?

You can export multiple functions by adding them to an object:

// myModule.js
function greet(name) {
    return `Hello, ${name}!`;
}

function farewell(name) {
    return `Goodbye, ${name}!`;
}

module.exports = { greet, farewell };