About JavaScript Formatter
Developers open JavaScript Formatter to beautify or minify JavaScript / TypeScript using Prettier — without uploading files to a remote service. Beautify or minify JavaScript / TypeScript using Prettier. Results are free to copy with no watermark or account wall. The differentiator is simple: your js input stays on this device.
What stays local: Source you format with JS.
What you can do with JavaScript Formatter
- Free online javascript formatter — no account required
- Pretty-print or tidy JS with clear structure
- Runs locally in your browser (nothing uploaded for processing)
- Works offline after installing the DevTooKit PWA
How to use JavaScript Formatter
- Open JavaScript Formatter. Go to the free JavaScript Formatter page on DevTooKit.
- Enter your input. Paste or type your js data — it stays in this browser tab.
- Run the tool. Use JavaScript Formatter to get results instantly with no server round-trip for processing.
- Copy and continue. Copy the output into your editor, PR, or API client as needed.
Privacy
What stays local: Source you format with JS. DevTooKit is local-first — no signup wall, no server-side processing for this tool, and no watermark on results.
Related tools
FAQ — JavaScript Formatter
Privacy, offline use, and how this free online tool works.
Does JavaScript Formatter upload my data to a server?
No. JavaScript Formatter runs in your browser. Your input stays on this device and is not sent to DevTooKit for processing.
Is JavaScript Formatter free?
Yes — free, with no account and no paywall to use the core js workflow.
Will JavaScript Formatter change my data unexpectedly?
It reformats with standard rules for readability. Invalid input returns a clear error instead of silently corrupting your file.
Can I use JavaScript Formatter offline?
Yes after the first visit. Install DevTooKit as a PWA and this tool keeps working without a network connection.