JavaScript Beautifier
Reformat dense JavaScript into readable code locally for debugging.
JavaScript Beautifier
Processed entirely in your browser. No uploads, no background processing, and no account required.
Ctrl+Enter Beautify Ctrl+Shift+Enter Validate Ctrl+Shift+C Copy
JavaScript input Editable input
1 line | 0 chars | 0.0 KB
Beautified JavaScript Read only output
1 line | 0 chars | 0.0 KB
Ready Browser only
Paste content into the input editor and run an action.
How ZeroData protects your privacy
- ✓ No Uploads: Processing happens entirely via client-side JavaScript.
- ✓ No Storage: We do not have a database. We physically cannot save your data.
- ✓ No Tracking: We don't log what you process or track your inputs.
- ✓ Verifiable: Check your DevTools Network tab. You will see 0 outbound requests.
How to Use the JavaScript Beautifier
- Paste JavaScript into the input editor.
- Use Beautify to reformat the code with normalized spacing and indentation.
- Use Validate to check that the code parses cleanly.
- Copy or download the result once the output looks right.
Frequently Asked Questions
Does this beautifier support modern JavaScript syntax?
Yes. It uses a browser-bundled formatter that can parse common modern JavaScript syntax.
Is the code sent to a server?
No. Formatting and validation stay on your device.
Can I validate code without changing it?
Yes. The Validate action checks syntax and reports any parser error in the status panel.
Related Tools
HTML Formatter
Pretty-print messy markup and inspect structure without exposing page code.
CSS Minifier
Shrink stylesheets for production with browser-only processing and instant output.
Regex Tester
Test regex patterns instantly in-browser with no uploads, no logging, and immediate match feedback.
JSON to TypeScript
Generate TypeScript interfaces from JSON API responses locally and securely.