Node.js - create custom modules

In this article, we would like to show you how to create custom modules in Node.js.

Note: below solution will help you to split your JavaScript project into multiple files.

Simple steps:

1. Create module file with some logic and use predefined exports object to make it available from outside of the module.
   Example myModule.js file content:

   exports.myFunction = function () {
       console.log('Message from myFunction.');
   }
   
   // Put more exports here ...

   Note: you can export multiple functions and objects from myModule.js.

2. Import the module inside another JavaScript file using require(), so you can use the function.
   Example index.js file content:

   const myModule = require('./myModule.js');
   
   myModule.myFunction();

   Note: address your local modules / files always with ./ prefix - with relative paths.

3. Run index.js file using Node.js.
   Execute the command:

   node ./index.js

   Output:

   Message from myFunction.

Project structure

app/
 ├── index.js
 └── myModule.js

References

• Creating Node.js modules | npm Docs