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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.

2,171

106 commits

updated Jul 13, 2026

runjs.app

See the code

README

RunJS

Twitter Follow

image

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 🔬
  • Great for learning and teaching 🧑‍🏫
  • Support for code completion, type checking and documentation on hover ⚡️
  • Easily install NPM packages 🚀
  • Save snippets and build a snippet library 🧑‍💻
  • Includes access to Node.js and Browser APIs 🖥️

Download the latest release here.

Acknowledgements

RunJS icon designed by Giuseppe Caruso

desktop-app
desktop-application
electron
electron-app
electron-application
javascript
javascript-editor
linux
macos
nodejs
playground
runjs
typescript
windows

Significant stargazers

Lars Kappert

1,118 followers · starred Jan 2019

Kyle Simpson

45,441 followers · starred Jan 2019

dnalborczyk

47 followers · starred Oct 2019

EdOverflow

3,642 followers · starred Nov 2019

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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.

2,171

106 commits

updated Jul 13, 2026

runjs.app

See the code

README

RunJS

Twitter Follow

image

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 🔬
  • Great for learning and teaching 🧑‍🏫
  • Support for code completion, type checking and documentation on hover ⚡️
  • Easily install NPM packages 🚀
  • Save snippets and build a snippet library 🧑‍💻
  • Includes access to Node.js and Browser APIs 🖥️

Download the latest release here.

Acknowledgements

RunJS icon designed by Giuseppe Caruso

desktop-app
desktop-application
electron
electron-app
electron-application
javascript
javascript-editor
linux
macos
nodejs
playground
runjs
typescript
windows

Significant stargazers

Lars Kappert

1,118 followers · starred Jan 2019

Kyle Simpson

45,441 followers · starred Jan 2019

dnalborczyk

47 followers · starred Oct 2019

EdOverflow

3,642 followers · starred Nov 2019

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Repository for Quokka.js questions and issues

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tal-tech/electron-playground

This is a project to quickly experiment and learn electron related APIs

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electron/fiddle

:electron: 🚀 The easiest way to get started with Electron

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atom/electron

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