dauntexlabs

Code Formatter

Format and minify JSON, CSS, HTML and JavaScript.

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About Code Formatter

This code formatter beautifies or minifies four languages: JSON, CSS, HTML/XML and JavaScript. Paste your source, pick the language and mode, and the formatted result appears straight away with a character count showing how much it grew or shrank. You can copy it or download it as a file with the right extension.

It is a quick way to make a minified stylesheet readable, tidy a messy HTML snippet, or squeeze a small script before pasting it somewhere. Formatting runs in your browser.

Be aware of how each language is handled. JSON is fully parsed and re-serialised, so invalid JSON shows an error. CSS, HTML/XML and JavaScript use lightweight best-effort formatters rather than a full parser: JavaScript formatting is heuristic and can lay out complex one-liners imperfectly, minifying JavaScript only removes comments and whitespace (it does not rename variables), and CSS comments are dropped.

How to use

  1. Choose a Language: JSON, CSS, HTML/XML or JavaScript.
  2. Pick Beautify to indent the code or Minify to strip whitespace and comments.
  3. For Beautify, choose an Indent of 2 spaces, 4 spaces or Tab.
  4. Paste your code into the source panel.
  5. Copy the formatted output or download it as a file.

FAQ

Which languages does the code formatter support?+
JSON, CSS, HTML (which also works for simple XML) and JavaScript. Other languages such as TypeScript, SQL, Python or YAML are not supported; TypeScript may partly work in JavaScript mode, but type syntax is not understood.
Is the JavaScript minifier a replacement for Terser or esbuild?+
No. It removes comments and collapses whitespace while keeping strings, template literals and regular expressions intact, but it does not rename variables, remove dead code or check syntax. For production bundles, use a real build-tool minifier.
Will beautifying HTML change my page?+
It re-indents tags based on nesting and collapses whitespace between tags. That also applies inside pre, script, style and textarea elements: their contents are re-indented, and inline script containing a less-than sign can be split apart, so check those blocks by hand. Inline elements that relied on whitespace between tags can render slightly differently too. Minifying HTML also removes comments.
Why does JSON mode show an error?+
JSON is parsed strictly, so trailing commas, single quotes, comments or unquoted keys cause a "Formatting failed" message. For relaxed JS-style objects, the separate JSON formatter tool has a loose parsing option.
Does the formatter highlight syntax?+
No. Input and output are plain text areas without colour highlighting; the tool focuses on indentation and minification.

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