Is this JavaScript playground completely free?

Yes, 100% free with no signup, no ads, and no usage limits. We believe developer tools should be accessible to everyone.

Is my code private and secure?

Absolutely. All code runs locally in your browser using a sandboxed iframe. Nothing is ever sent to our servers. Your code stays on your device.

What JavaScript features and versions are supported?

We support all modern JavaScript (ES2022+) features including async/await, classes, modules syntax, optional chaining (?.), nullish coalescing (??), private class fields, top-level await, and more.

Can I use npm packages in the playground?

Not directly in this playground. For npm packages, use our HTML/CSS Playground where you can add CDN script tags, or copy the package code directly.

Why are fetch and XMLHttpRequest disabled?

For security reasons, network requests are blocked in the sandbox to prevent malicious code from making unauthorized requests or accessing external resources.

Can I manipulate the DOM and create HTML elements?

Yes! You can create, modify, and interact with DOM elements. Created elements appear in a preview area, and you can add event listeners for interactivity.

Is there a time limit for code execution?

Yes, code execution is limited to 5 seconds to prevent infinite loops from freezing your browser. This is sufficient for most testing scenarios.

How do I share my code with others?

Click the Share button to copy a URL that encodes your code. Anyone with the link can view, edit, and run your code instantly.

Does the playground work offline?

Yes! After the first visit, the playground is cached and works completely offline. Perfect for coding on the go.

What keyboard shortcuts are available?

Ctrl+Enter (Run), Ctrl+S (Download), Ctrl+D (Duplicate line), Ctrl+/ (Toggle comment), Tab (Indent), Shift+Tab (Outdent). Auto-bracket completion is also enabled.

Can I use this for learning JavaScript?

Absolutely! We provide 15+ example snippets covering variables, arrays, objects, functions, classes, async/await, promises, DOM manipulation, and advanced topics like generators and proxies.

How does this compare to CodePen or JSFiddle?

Our playground is focused on pure JavaScript execution with better privacy (no tracking), faster load times, offline support, and a cleaner interface. For HTML/CSS projects, use our HTML/CSS Playground.

Is this JavaScript playground completely free?

Yes, 100% free with no signup, no ads, and no usage limits. We believe developer tools should be accessible to everyone.

Is my code private and secure?

Absolutely. All code runs locally in your browser using a sandboxed iframe. Nothing is ever sent to our servers. Your code stays on your device.

What JavaScript features and versions are supported?

We support all modern JavaScript (ES2022+) features including async/await, classes, modules syntax, optional chaining (?.), nullish coalescing (??), private class fields, top-level await, and more.

Can I use npm packages in the playground?

Not directly in this playground. For npm packages, use our HTML/CSS Playground where you can add CDN script tags, or copy the package code directly.

Why are fetch and XMLHttpRequest disabled?

For security reasons, network requests are blocked in the sandbox to prevent malicious code from making unauthorized requests or accessing external resources.

Can I manipulate the DOM and create HTML elements?

Yes! You can create, modify, and interact with DOM elements. Created elements appear in a preview area, and you can add event listeners for interactivity.

Is there a time limit for code execution?

Yes, code execution is limited to 5 seconds to prevent infinite loops from freezing your browser. This is sufficient for most testing scenarios.

How do I share my code with others?

Click the Share button to copy a URL that encodes your code. Anyone with the link can view, edit, and run your code instantly.

Does the playground work offline?

Yes! After the first visit, the playground is cached and works completely offline. Perfect for coding on the go.

What keyboard shortcuts are available?

Ctrl+Enter (Run), Ctrl+S (Download), Ctrl+D (Duplicate line), Ctrl+/ (Toggle comment), Tab (Indent), Shift+Tab (Outdent). Auto-bracket completion is also enabled.

Can I use this for learning JavaScript?

Absolutely! We provide 15+ example snippets covering variables, arrays, objects, functions, classes, async/await, promises, DOM manipulation, and advanced topics like generators and proxies.

How does this compare to CodePen or JSFiddle?

Our playground is focused on pure JavaScript execution with better privacy (no tracking), faster load times, offline support, and a cleaner interface. For HTML/CSS projects, use our HTML/CSS Playground.

JavaScript Playground

simple

Run JavaScript code online instantly. Free browser-based JS compiler with console output, syntax highlighting, DOM manipulation, and code sharing. No signup required. Perfect for learning, testing, and prototyping.

Compilers & Playgroundsjavascriptjscompilerplayground

100% Private - Runs Locally

How to Use

1Write or paste JavaScript code in the syntax-highlighted editor
2Press Ctrl+Enter or click the Run button to execute your code
3View console output (log, warn, error, info) in the Console panel
4Use Ctrl+D to duplicate lines, Ctrl+/ to toggle comments
5Click Share to generate a URL containing your code
6Select from 15+ examples covering all JavaScript concepts
7Download your code as a .js file for local use

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