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Node.js - create custom modules

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Created by:
Palus-Bear
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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

Alternative titles

  1. Node.js - create your own modules
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