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Cosmovex
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JavaScript Editor — React IDE icon
Cosmovex
JavaScript Editor — React IDE

Run JavaScript on Your Phone

Test a script, prototype a React component, or debug a logic problem — all without touching a laptop. JavaScript Editor — React IDE runs JavaScript directly on Android.

Free on Google Play

JavaScript developers often find themselves away from a computer but needing to test something — a utility function, a React hook, an API response transform. Instead of waiting to get to a laptop, you can run it right now on your phone.

JavaScript Editor — React IDE runs JavaScript using a V8-based engine embedded in the app. This means real JavaScript execution, not a simulation. setTimeout works. Promises work. Modern array methods, object destructuring, optional chaining — all of it works exactly as you'd expect.

The app is especially useful for React developers. You can write a component, import it in another file, and see the rendered output in a preview panel. It's not a replacement for a full development environment, but for quick prototyping and testing, it's faster than spinning up a sandbox on your phone's browser.

Output appears in a console panel that shows logs, errors, and return values. You can run scripts interactively, one-shot, or as part of a multi-file project. The whole workflow is optimized for the small screen — large touch targets, readable fonts, and a layout that makes sense on mobile.

What you get

V8-based JavaScript engine — real execution
React component rendering and preview
Full ES6+ support including async/await
Console output with log and error display
Import popular JS libraries
Interactive REPL mode
Multi-file project support
Runs offline, no account needed
Responsive editor for portrait and landscape
Share output and code snippets

Ready to try JavaScript Editor — React IDE?

Free to download. No subscription required to get started.

Download Free on Google Play