Write JavaScript
Type code or start from an example: arrays, async/await, classes.
WAVESPEED AI JAVASCRIPT COMPILER Runs in your browser
100% FREE
Online JavaScript CompilerRun JavaScript and TypeScript in your browser.
Write JavaScript, press Run and read the console: objects, tables, timers and errors with line numbers.
TypeScript works too, and an HTML/CSS/JS preview is one tab away.
Full console outputTypeScript supportShare by link
No sign-up Nothing to install Sandboxed in your browser
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Your code runs on your device and is saved only in this browser.
THREE SIMPLE STEPS
How to use the JavaScript compiler
Run it
Press Run or Ctrl+Enter and read the console output.
Fix and share
Errors point to the line. Copy a link or save the file when you're done.
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JavaScript compiler FAQ
How do I run JavaScript online?
Type your code in the editor and press Run. console.log output, tables and errors appear in the output panel.
Does it support TypeScript?
Yes. Switch to TypeScript: types are removed before running and line numbers stay the same.
Can I use await?
Yes, await works at the top level, so you can test promises and timers directly.
Is it safe to run code here?
Code runs in a sandbox in your browser with no access to this site's cookies or storage, and Stop ends it at any time.
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Online JavaScript Compiler
Full console output · TypeScript support · Share by link