runjs ☆
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Description:
JavaScript playground that auto-evaluates as code is typed
Type: Cask  |  Latest Version: 4.0.4@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
May 5, 2026 8:17pm 4.0.4 0 VERSION_BUMP c960e162
Apr 30, 2026 4:53pm 4.0.2 0 VERSION_BUMP 72113a76
Apr 29, 2026 1:58pm 4.0.1 0 VERSION_BUMP 3a81cfaa
Apr 28, 2026 10:06pm 4.0.0 0 VERSION_BUMP 147c5752
Sep 15, 2025 1:02pm 3.1.2 0 VERSION_BUMP a7123956
Dec 20, 2023 11:24am 2.10.1 0 VERSION_BUMP bd163c23
Apr 20, 2023 8:11am 2.9.0 0 VERSION_BUMP b2e2e1fb
Mar 12, 2023 3:24am 2.8.0 0 VERSION_BUMP 38b858f0
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