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Paste JavaScript, CSS, HTML, or JSON below and click Format for consistently indented output.

Input: bytes
Output: bytes

Steps

  1. Paste the code or JSON you want formatted into the left pane.
  2. Click Format.
  3. Read the re-indented result in the right pane, or click Copy Output to copy it.

Click Clear to empty both panes and start over with a new snippet.

Code Beautifier

Paste JavaScript, CSS, or HTML into the input pane and click Format to get the same code back re-indented and consistently spaced - no upload, no install, and nothing leaves your browser. JSON input is pretty-printed the same way, with two-space indentation.

Code beautifier vs JSON Parser - which do you need? This tool re-indents JavaScript, CSS, and HTML source, and pretty-prints JSON as a side effect of the same paste-and-click flow. If you specifically need to validate a JSON payload, browse it as an expandable tree, or find which field holds a parse error, use the JSON Parser instead - it is built for that job and highlights types, array indexes, and errors inline. Reach for this tool when the input is a JS, CSS, or HTML snippet, or when plain JSON pretty-printing without a tree view is all you need.

How the language is detected

How the language is detected in Code Formatter / Beautifier: JSON is checked first if the paste starts with {, [, a quote, a digit, or true/false/null; otherwise HTML if it starts with <, CSS if it looks like rule blocks, else JavaScript - then js-beautify re-indents in this browser tab with no upload.

Everything above runs in this browser tab. Pasted code is never uploaded, sent to an analytics service, or written to any server - it exists only in the page's memory until you close the tab or paste something else.

What this does not do

The tool re-indents and re-spaces code; it does not lint your code, catch logic bugs or unused variables, or rewrite your code semantically - it will not rename variables, restructure functions, or remove dead code. Language detection is a heuristic, not a parser for every language: if you paste Python, Java, or another language the tool does not recognise, the JavaScript beautifier runs on it anyway and the result may look odd, so check the output before you rely on it.

Typical uses

Typical uses for Code Formatter / Beautifier: when a teammate pastes minified JavaScript into a chat and you need to read it, when a CSS snippet arrives on one line and you want it indented, or when HTML needs consistent spacing before it goes into a review - indentation only, no linting rewrite.

For the opposite job of shrinking a stylesheet for production, see the CSS minifier; to expand an already-minified stylesheet back to a readable form, see the CSS unminifier. To compare two versions of a file side by side instead of reformatting one, see the text diff tool. The developer tools hub lists the full set, every one running in-browser with no upload.

See all Back to Developer Tools →

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Frequently Asked Questions

What does the code beautifier format?

JavaScript, CSS, and HTML source code. JSON input is pretty-printed too, using JSON.stringify with two-space indentation instead of the code beautifier.

How does it know which language I pasted?

It checks for JSON first, then looks at the input shape: text starting with < is treated as HTML, text that looks like CSS rule blocks is treated as CSS, and everything else is treated as JavaScript.

Is my code uploaded anywhere?

No. Formatting runs entirely in this browser tab; nothing you paste is sent to a server or an analytics service.

Does this replace the JSON Parser tool?

No. Use the JSON Parser when you need to validate JSON, browse it as a tree, or locate a parse error. This tool is for re-indenting JS, CSS, and HTML, with plain JSON pretty-printing as a side benefit.

Will it fix bugs in my code?

No. It only changes indentation and spacing; it does not check logic, flag unused variables, or rewrite your code.