BYTETOOLS

JavaScript Formatter

Beautify JavaScript online with token-aware indentation. Respects strings, template literals, regex and comments. A quick, private, in-browser JS formatter.

What is the JavaScript Formatter?

The ByteTools JavaScript Formatter re-indents JS code using a token-aware scanner: it understands strings, template literals (including nested ${} expressions), regex literals and comments, tracks braces, brackets and parentheses, and breaks lines after statements and opening braces.

  • Token-aware indentation on braces, brackets and parentheses
  • Safely skips strings, template literals, regex and comments
  • New line after statements and opening braces
  • Keeps else / catch / finally on the closing-brace line
  • Preserves existing line breaks (ASI-safe)
  • 100% client-side — code never leaves your browser

How to use the JavaScript Formatter

  1. 1

    Paste your JavaScript into the input box.

  2. 2

    Choose an indentation style: 2 spaces, 4 spaces or tab.

  3. 3

    Click Format JavaScript.

  4. 4

    Copy the beautified code or download it as a .js file.

About the JavaScript Formatter

The ByteTools JavaScript Formatter re-indents JS code using a token-aware scanner: it understands strings, template literals (including nested ${} expressions), regex literals and comments, tracks braces, brackets and parentheses, and breaks lines after statements and opening braces. Keywords like else, catch and finally stay attached to their closing brace.

This is a light formatter, not an AST-based tool like Prettier — it will not rewrite your expressions, re-wrap long lines or normalize quotes. What it does well is fast cleanup: making minified or badly indented snippets readable, normalizing indentation to 2 spaces, 4 spaces or tabs, and preserving your existing line breaks so code that relies on automatic semicolon insertion keeps working.

Formatting runs 100% locally in your browser. Your source code is never uploaded, so proprietary scripts and unreleased features stay on your machine.

Frequently asked questions

How is this different from Prettier?

Prettier parses your code into a full syntax tree and re-prints it from scratch, enforcing line width and style rules. This tool is a lightweight tokenizer-based formatter: it fixes indentation and line breaks without rewriting expressions. It is instant and dependency-free, but for enforced team style in a repo, use an AST formatter.

Can it format minified JavaScript?

Yes — that is its main job. Minified code is one long line of statements; the formatter breaks it after every semicolon and brace and re-indents the blocks, turning it into readable code. Shortened variable names from the original minification cannot be restored, though.

Will formatting change how my code runs?

No. The formatter only inserts or removes whitespace and line breaks in positions JavaScript treats as insignificant, and it deliberately preserves your existing line breaks so code relying on automatic semicolon insertion is not merged onto one line.

Does it handle template literals and regex correctly?

Yes. Template literals — including nested ${ } expressions with their own strings and braces — are passed through untouched, and regex literals are detected from context so the slashes are not confused with division operators.

Is my source code uploaded anywhere?

No. The formatter is plain client-side JavaScript running in your browser tab. Nothing is transmitted or stored, making it safe for proprietary and commercial code.

Guides for JavaScript Formatter

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