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JavaScript Formatter

Clean, organize and beautify your JS code instantly

JS PRO

Indentation

Brace Style

Quote Style

Semicolons

Extras

Break Chained Methods Comma First Style

Formatted Output

Source (Minified/Messy)

Beautified Result

Turn a wall of compressed JavaScript into readable code

Minified bundles, code pasted from a chat window, or a script edited by five people with five different habits all share one problem: they are hard to read. The JavaScript Formatter re-indents and re-wraps your code according to settings you pick, then shows the original and the cleaned version next to each other so you can confirm nothing looks wrong.

Step by step

Paste your script into Source Code, or use Sample to load a short one-line function.
Set Indentation to 2, 4 or 8 spaces (4 is preselected).
Choose a Brace Style: Collapse (K&R), Expand (Allman) or End Expand.
Optionally set Quote Style and Semicolons, and tick Break Chained Methods or Comma First Style.
Click Beautify & Format JavaScript. Use Copy or Download to save the result as script.js.

A stats bar under the result reports the size, line count and character count of the formatted code.

Options explained

Brace Style decides whether the opening brace stays on the same line as the statement or moves to its own line.
Quote Style can convert strings to single or double quotes. Leave it on Original if your code mixes quotes inside strings, because the conversion is a simple text replacement and can misfire on a string that contains the other quote type.
Semicolons can add missing ones or strip them. Again this is pattern-based, so review the output before committing it, especially in code that relies on automatic semicolon insertion.
Comma First places commas at the start of lines in lists and object literals, a style some teams use to make diffs cleaner.

When people reach for it

Reading a minified third-party script while debugging a browser issue.
Normalizing a snippet to your project's indentation before pasting it into a pull request.
Cleaning up code copied from a tutorial or Stack Overflow answer.
Making a one-off script legible before handing it to a colleague.

Good to know

Formatting changes whitespace and layout, not behavior, but the quote and semicolon rewrites are heavier-handed, so run your tests afterwards. Renamed variables in minified code stay renamed: the tool cannot restore original names. The work happens in your browser, and the formatter needs its beautifier library to have loaded; if the page could not load it, the code is returned unchanged.

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Frequently Asked Questions

Can it restore original variable names in minified code?

No. Formatting only rearranges whitespace, line breaks and braces. If a build tool shortened names to a, b and c, those stay that way. You would need the original source or a source map to recover meaningful names.

What does Break Chained Methods do?

It puts each call in a chain such as fetch().then().catch() on its own line, indented under the first call. This makes long promise or array chains easier to scan, at the cost of a longer file.

Is it safe to switch quote style automatically?

It is convenient but simplistic. The conversion swaps quote characters using a text pattern, so strings that contain the other quote type, or template literals, may be altered incorrectly. Keep Original when unsure and review the diff.

Can I download the formatted code?

Yes. After clicking Beautify & Format JavaScript, the result panel offers a Copy button and a Download button that saves the code as a file named script.js. Your original stays visible beside it for comparison.

Does the formatter change what my code does?

Layout changes do not affect behavior. Adding or removing semicolons and converting quotes are text-based rewrites, so test the result if you use those options. Indentation and brace style alone are safe.