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lukehaas/RunJS

RunJS is a JavaScript playground for macOS, Windows and Linux. Write code with instant feedback and access to Node.js and browser APIs.

RunJS

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RunJS is a playground for JavaScript and TypeScript. It runs your code automatically and shows you instant results.

Why RunJS?

  • An isolated space to run code experiments ๐Ÿ”ฌ
  • Great for learning and teaching ๐Ÿง‘โ€๐Ÿซ
  • Support for code completion, type checking and documentation on hover โšก๏ธ
  • Easily install NPM packages ๐Ÿš€
  • Save snippets and build a snippet library ๐Ÿง‘โ€๐Ÿ’ป
  • Includes access to Node.js and Browser APIs ๐Ÿ–ฅ๏ธ

Download the latest release here.

Acknowledgements

RunJS icon designed by Giuseppe Caruso

Contributors

Created October 14, 2018
Updated March 9, 2026