JavaScript Formatter
Beautify and format JavaScript code with Prettier
Ctrl + Enter to re-format
Ready · 2-space indent
Formatted JavaScript will appear here
Paste or type JavaScript above to begin
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JavaScript Formatter – Beautify JS Code with Prettier
Format and beautify JavaScript with Prettier. Choose 2-space, 4-space, or tab indentation; formatting runs entirely in your browser.
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What is JavaScript Formatter?
A free online JavaScript formatter powered by Prettier. Paste minified or messy JavaScript or JSX and get clean, readable output automatically as you type. Choose 2-space, 4-space, or tab indentation. All formatting runs entirely in your browser via Prettier's standalone build, and formatted code can be downloaded.
- javascript
- formatter
- beautifier
- prettier
- js
- code
Features
What you get with JavaScript Formatter.
Powered by Prettier
Industry-standard formatter used by millions of developers worldwide.
Adjustable Indentation
Choose 2 spaces, 4 spaces, or tabs.
Live Formatting
Output updates automatically as you type — no button press needed.
Browser-Based Processing
Formatting runs locally in your browser and can be downloaded as a .js file.
How to use JavaScript Formatter
Follow these steps to get the best results.
Paste your JavaScript
Paste minified or messy JS into the input — formatting starts automatically as you type.
Choose an indent size
Pick 2-space, 4-space, or tab indentation for the formatted output.
Copy or download the code
Copy the Prettier-formatted output into your editor, or download it as a file.
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Frequently asked questions
Common questions about JavaScript Formatter.
No — only whitespace, indentation, and style are adjusted. Variable names, function logic, and values are never modified.
The formatter uses Prettier's Babel parser which supports all modern JavaScript including ES2022+, JSX, and class fields.
No. The formatter uses fixed Prettier settings: double quotes, semicolons, and trailing commas. Only indentation (2 spaces, 4 spaces, or tabs) is adjustable.
Yes — paste any minified JS and the formatter will expand it into clean, readable, properly indented code.
No. Prettier runs entirely in your browser as pure JavaScript. Nothing is uploaded or stored.
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