Use the package manager icon to bring in external libraries. Final Thoughts
While it looks simple, RunJS packs features that cater to professional workflows. 1. Working with NPM Packages
Paste a tricky function and iterate until it works. Use the package manager icon to bring in external libraries
Access to Node.js globals and standard web APIs.
Because RunJS is powered by Babel, you don't have to worry about whether your environment supports Top-Level Await, Optional Chaining, or Nullish Coalescing. It just works. RunJS vs. The Competition Browser Console Quokka.js (VS Code Plugin) Persistence Auto-saves tabs Lost on refresh Tied to a file NPM Support Easy Install Hard/Manual Environment Node.js & Web UI Dedicated App Integrated Inside Editor Getting Started To get started, simply download the app from runjs.app. Open a New Tab: Start typing JavaScript or TypeScript. Working with NPM Packages Paste a tricky function
RunJS reduces this to a single step: This "Live Coding" approach makes it incredibly useful for:
If you’ve ever found yourself opening the browser console just to test a small snippet of JavaScript, or creating a temp.js file only to delete it five minutes later, you’ve felt the friction of modern development. It just works
Use the latest ECMAScript features seamlessly.
was built to solve exactly that. It is a desktop-based "scratchpad" for JavaScript and TypeScript that provides an instant, feedback-driven environment for experimentation. Here is everything you need to know about why it’s becoming a staple in the web developer's toolkit. What is RunJS?