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A JavaScript playground that auto-evaluates as you type
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docs update for release 1.3.0 Feb 17, 2019 update changelog Jun 17, 2019 update changelog Apr 22, 2019 list version deps Feb 2, 2019



Download the latest release here.

RunJS is an JavaScript playground that auto-evaluates your code as you type and outputs the results to a console pane.



TypeScript and modern JavaScript features are supported through Babel transpilation. Additionally, Node and browser APIs are available.

RunJS can import node packages from existing JavaScript projects by pointing it's working directory to your chosen project directory.


Node packages can also be installed directly through this window, opened from the Action menu.


RunJS also has a number of configurable options, accessed via the preferences window.


RunJS executes JavaScript against the following versions of Node, V8 and Chromium:

  • Node: 10.11.0
  • V8: 6.9.427.24-electron.0
  • Chromium: 69.0.3497.106
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