Online JavaScript Compiler

About this JavaScript compiler

This online JavaScript compiler runs your code with Node.js on a server, so you can test functions, arrays, objects and loops without opening a browser console. Use console.log() to print results. Because the code does not run in a browser, objects such as window and document are not available.

How to use the online JavaScript compiler

  1. Write or paste your JavaScript code in the editor. Sample code is already loaded.
  2. Click Run.
  3. Read the result in the black panel. Errors from your code appear there too.

JavaScript compiler FAQs

Does this run in my browser?

No. The code runs with Node.js on a server, so browser objects such as window and document are not available. Use console.log() to print results.

Can I test HTML or DOM code here?

No. For HTML, CSS and DOM code, use your browser console or an HTML editor. This tool is for running JavaScript logic.

Does it support user input?

Not at the moment. Put your test values directly in the code.

Learn JavaScript

Want to go beyond the basics? Follow our step-by-step JavaScript tutorial.

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