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Overview
Live results as you type. Built-in Node.js and browser environments, install npm packages, prototype UI live - no project, no setup, no signup. Mac, Windows, Linux.
News
Music theory for programmers
I can't play an instrument, so I worked out music theory in JavaScript instead. Twelve notes, scales and chords, derived from scratch with code you can hear.
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What's New in RunJS v4: Dedicated Runtimes, Logpoints, and a Rebuilt Output Panel
RunJS v4 introduces dedicated runtime environments, a web view, logpoints, a new status bar, and a rebuilt output panel - along with upgraded Node.js, Chromium, and V8.
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How to Run TypeScript: A Step-by-Step Guide
Discover how to run TypeScript in this comprehensive beginner's guide. Set up your environment, use ts-node, and explore online tools to start coding today.
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Introducing AI Chat in RunJS v3: Your New Coding Companion
With the release of RunJS version 3 comes AI Chat, a new feature powered by OpenAI that brings AI-assisted coding into RunJS.
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How to Run JavaScript Code: A Practical Guide
Discover how to run JavaScript in browsers, with Node.js, and online. This guide provides clear, step-by-step instructions for all skill levels.
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