JavaScript Console
Run JavaScript code in an interactive online playground
Code Editor
Console Output
What Is the JavaScript Console?
The JavaScript Console is an online playground to run JavaScript in your browser. Write code, click Run, and see output. No setup required. The ECMAScript specification defines the language.
Your snippet runs in this browser tab and never goes to our server. Use console.log to print values. For formatting code, use JavaScript Formatter. For validation, use JavaScript Validator. For minifying, use JavaScript Minifier.
How to Use This Tool
Write or Paste Code
Type or paste JavaScript in the editor. Use Sample to load example code. Use Clear to reset. Use console.log to output values.
Run Code
Press Run Code to execute the snippet. Anything you log shows up in the right panel, and if the code throws, the error message lands there too.
Clear and Iterate
Use Clear Output to reset the console. Edit and run again. For formatting before sharing, use JavaScript Formatter.
JavaScript Console Examples
Try this example in the editor above. Copy and paste, then click Run Code.
Example: Subscriber object
When the JavaScript Console Helps
When testing snippets, learning JavaScript, or debugging logic, the console gives instant feedback. Great for quick experiments without a local setup. For Node.js APIs or DOM, use a full IDE or browser dev tools. For obfuscated code, use JavaScript Deobfuscator first.
Frequently Asked Questions
Is my code private?
Yes. Your snippet executes in this tab and is never uploaded.
What can I run?
Standard JavaScript (ES5, ES6+). No DOM, no Node.js modules. Use console.log for output.
Is the code sandboxed?
No, and it is worth knowing. The page runs your code with eval() in the same tab, so it has the same reach as any script on a web page: it can call fetch(), read this page and use the browser storage for this site. It cannot touch your file system. Only paste code you understand, and never paste a snippet someone sent you that you have not read.
Console vs Formatter?
Console runs code. Formatter only formats it. Use both: format for readability, run for testing.
Does it support async/await?
Yes. Anything your browser supports works here, because the code runs in the browser's own JavaScript engine.
Related Tools
Tips
- Use
console.log()to output values - All standard JavaScript features are supported
- Code runs in this tab with eval(), so treat it like any script you run
- Press Ctrl+Enter or click "Run Code" to execute