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JavaScript Formatter — free, and it runs in your browser

Format JavaScript and TypeScript with Prettier in your browser.

  • JavaScript, TypeScript, JSX and TSX, all through Prettier.
  • The same output your project’s Prettier would produce, without installing anything.
  • For a snippet from a code review, a gist or a Stack Overflow answer.

Your code

Tab indents · Esc then Tab to leave1 line

Formatted code

1 line

  • 70 tools

    Free, with no account and no watermark

  • 0 bytes

    Of your files or text uploaded — this tool runs in the tab

  • No queue

    The work happens in this tab, not in a line behind other users

Three steps, nothing to install

JavaScript Formatter in three steps

  1. JS123456Paste it in — it never leaves the tab

    Paste the code

    JavaScript, TypeScript, JSX or TSX. It is parsed in the page — a proprietary snippet is not sent anywhere.

  2. JSJSConverted on your own device

    Format it

    Prettier itself is loaded into the tab and run on your code, so the result matches the tool your repository already uses.

  3. Copy JS

    Copy the formatted code

    Ready to paste back into your editor or a review comment.

Why use JavaScript Formatter

  • Actually Prettier

    Not a lookalike that indents by brace depth. The real library runs in the page, so the output is byte-identical to what your project’s formatter would write.

  • Parsed, not pattern-matched

    The input is read with a real parser and the output is written from what it found, rather than by rewriting the text with regular expressions.

  • Your text stays in the page

    What you paste is not transmitted or stored, so an API response full of customer records, a token or an internal query never leaves your machine.

Frequently asked questions

Yes. Switch the parser above — TypeScript for .ts files, TSX/JSX for anything containing JSX syntax. The plain JavaScript parser rejects type annotations.

Formatting versus un-minifying

These are different jobs and it is worth being clear about which one a formatter does. Minification removes whitespace and renames variables, inlines functions and drops comments. A formatter reverses only the first of those.

So running minified bundle code through here gives you readable structure — you can follow the control flow, see the nesting, and set breakpoints — but the identifiers stay as a, b and t. Recovering real names requires the source map that the build produced.

Why Prettier has so few options

Prettier deliberately offers a handful of settings instead of the dozens older formatters had. The reasoning is that most formatting arguments are not worth having: any consistent style beats an inconsistent one, and removing the choice removes the argument. It parses your code into a syntax tree and prints that tree from scratch, so the output depends only on the code's meaning, never on how it was originally laid out.

For other formats, see the JSON formatter, HTML beautifier, CSS minifier and SQL formatter.

Often used alongside

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70 tools, none of which want your file

Everything this tool does happens in the page you are looking at. No account, no upload, no watermark.

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