runjs ☆
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Description:
JavaScript playground that auto-evaluates as code is typed
Type: Cask  |  Latest Version: 3.2.2@0  |  Tracked Since: Dec 28, 2025
Links: Homepage  |  formulae.brew.sh
Category: Developer tools
Tags: javascript typescript playground developer-tools editor
Install: brew install --cask runjs
About:
RunJS is a desktop JavaScript and TypeScript playground that provides an interactive editor with immediate evaluation of code as you type. It supports modern JavaScript (ES6+) and TypeScript out of the box, offering a node-like environment with access to the file system and system clipboard. The tool is designed to replace browser-based consoles, offering better performance and native OS integration for developers needing quick calculations or code testing.
Key Features:
  • Real-time evaluation as you type
  • Support for JavaScript and TypeScript
  • File system and module import support
  • Clean, native desktop interface
Use Cases:
  • Quickly testing JavaScript snippets without opening a browser
  • Performing mathematical calculations or data transformations
  • Prototyping logic for Node.js applications
Alternatives:
  • Quokka.js – Quokka runs inside VS Code, while RunJS is a standalone application.
  • Node REPL – RunJS provides a graphical interface with syntax highlighting, unlike the terminal-based Node REPL.
Version History
Detected Version Rev Change Commit
Sep 15, 2025 1:02pm 3.1.2 0 VERSION_BUMP a7123956
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