Node.js Custom Modules

A custom module is a JavaScript file created by the programmer and reused in another Node.js file.

Example

math.js

function add(a, b) {
    return a + b;
}

module.exports = add;
        

app.js

const add = require("./math");

console.log(add(10, 20));
        

Explanation

1. Create a separate JavaScript file.
2. Write a function inside the file.
3. Export it using module.exports.
4. Import it using require().
5. Use the function in another file.

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