ECMA.app

ECMA.app

The JS/TS playground that shows what your code does.

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ECMA.app is a web-based JavaScript & TypeScript playground that shows your code’s behavior in real-time. Track console logs visually, explore types, debug in a safer sandboxed environment — no setup, no noise, just code.
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Free
Launch tags:Productivity•Developer Tools•Tech
Launch Team / Built With
Universal-3 Pro by AssemblyAI
Universal-3 Pro by AssemblyAI
The first promptable speech model for production
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What do you think? …

Alberto Diaz
Maker
📌
👋 Hey Product Hunt! I'm excited to share ECMA.app — a developer-focused playground for JavaScript and TypeScript with a twist: it shows what your code is doing in a way that's visual, clean, and helpful. Why ECMA.app? As devs, we often want a quick space to test snippets, debug small functions, or visualize what’s happening behind the scenes. ECMA.app makes that easy, and fun: ✨ Real-time execution with visual console.log tracking 🧪 Support for ES modules and dynamic imports (via CDN) 🔐 Sandboxed environment using iframe + postMessage for safety 🧬 AST parsing (Recast) — coming soon: visual walkthrough of code execution! 🎨 Clear UI that highlights data types and output styles No setup, no build process, just instant feedback. It’s still early stage, and I’d love your feedback to make it even better — especially from fellow frontend devs, educators, or anyone who enjoys breaking JS just for fun 🤓 Thanks for checking it out! Happy coding, — Albert