Paste your JavaScript
Loading Prettier…
Indent:
Output
Formatted JavaScript appears here…
What This Tool Does
The JavaScript Formatter takes minified, obfuscated, or inconsistently indented JavaScript and reformats it with clean, readable indentation. It uses Prettier — the industry-standard code formatter — loaded from CDN, so the output matches what professional developers use in their local environments.
Everything runs in your browser. Your code is never transmitted to our servers.
How to Use
1. Paste your JavaScript into the input box or click Sample.
2. Choose your indent preference (2 spaces, 4 spaces, or tab).
3. Click Format & Beautify to format your code.
4. Click Copy Output to copy the result to your clipboard.
Frequently Asked Questions
Does this tool support modern JavaScript (ES6+)?
Yes. The formatter handles arrow functions, template literals, destructuring, async/await, optional chaining, and other modern JS syntax. It uses a token-based approach rather than execution, so it works on any valid JS syntax.
Why might my code look different after formatting?
The formatter adds consistent indentation and spacing but does not change logic. Semicolons, quote style, and line length are not altered — only whitespace structure is normalised.
Is my code sent to a server?
No. The formatter runs entirely in your browser using JavaScript string manipulation. Your code never leaves your device.
Can I format TypeScript or JSX?
The formatter works on most TypeScript and JSX syntax since it is token-based, but it is optimised for standard JavaScript. For complex TypeScript projects, a local Prettier setup is recommended.