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
Dec 20, 2023 11:24am	2.10.1	0	VERSION_BUMP	bd163c23