RunJS
RunJS is a desktop JavaScript playground that evaluates your code as you type and gives instant feedback. Ideal for prototyping ideas or trying out new libraries.
About RunJS
RunJS is a desktop application that provides a JavaScript scratchpad or playground where code executes as it is typed, with results displayed inline. It includes built-in Node.js and browser environments in a single application, and supports TypeScript and Babel transpilation. Users can install and reference npm packages directly within the app, import local Node modules, and inspect values using Magic Comments and Logpoints without adding console.log statements. It is available for macOS, Windows, and Linux, with the latest version listed as 4.1.0.
The application supports saving and reusing code snippets in a snippet library, and includes a feature for generating and running code through an AI chat interface. Additional platform-specific package formats are offered for Linux, including AppImage and .deb builds for x64 and Arm64 architectures.
RunJS is aimed at developers who need to quickly test JavaScript or TypeScript snippets, experiment with npm libraries, debug code, or prototype ideas without setting up a full project environment. It is also used in educational contexts, including coding instruction, tutoring, and bootcamp teaching, and the vendor states it is trusted by over 10,000 developers. It is developed by Haas Labs Ltd.
Key features
- Live JavaScript scratchpad that runs code as you type
- Built-in Node.js and browser environments in one app
- Install and experiment with npm packages
- TypeScript support and Babel transpilation
- Inspect values via Magic Comments and Logpoints without console.log
- Chat with AI to generate and run code
Frequently asked questions
What platforms does RunJS support?
RunJS is available as a desktop app for macOS, Windows, and Linux (AppImage and .deb, x64 and Arm64).
Does RunJS support TypeScript?
Yes, RunJS supports TypeScript and uses Babel transpilation.
Can I use npm packages in RunJS?
Yes, RunJS lets you install and experiment with npm packages directly in the playground.
Who is RunJS for?
It's used by professional developers, educators, and students for prototyping, debugging, learning, and teaching JavaScript.
Is RunJS free?
RunJS offers a free download.
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