RunJSOnline JavaScript Playground
Write and run code with instant live feedback.
Take Your Coding Offline – Try the RunJS Desktop App.
Fast, Lightweight, and Always Ready to Run
Feature Comparison
| Online | Desktop | |
|---|---|---|
| Run JavaScript and TypeScript | ✅ | ✅ |
| Autocomplete | ❌ | ✅ |
| NPM Packages | ❌ | ✅ |
| Type Checking | ❌ | ✅ |
| Node.js Integration | ❌ | ✅ |
| Hover Info | ❌ | ✅ |
| Snippets | ❌ | ✅ |
| AI Assistant | ❌ | ✅ |
| Multiple Tabs | ❌ | ✅ |
| Environment Variable Manager | ❌ | ✅ |
What people are saying
RunJS is a fantastic app for quick sanity checking and prototyping. I like it because I dont have to mash the up arrow a bunch of times to get to set up my testing state like I would in dev tools, and I like that it evaluates continuously unlike a simple node script.