Does this JavaScript tool change program behavior?

It only changes layout or removable whitespace. Review minified output before production use when code relies on unusual syntax.

Processing is local and your code is never uploaded.

JavaScript Formatter

Format and indent JavaScript code into a clean, readable structure directly in your browser.

This tool runs entirely in your browser. Your files are never uploaded to a server.

function greet(name) {
  const text='Hello '+name;
  return text;
}

What this formatter does

Adds line breaks after opening braces, closing braces, and semicolons, using two spaces per brace level. Ordinary quoted strings, template literals, escapes, and recognized line or block comments are kept while other whitespace is reduced.

How to use it

Paste JavaScript and inspect the result that updates immediately. Copy the output or use Reset to clear the editor; Reset does not restore the sample.

Important limitations

This is a character-based brace formatter, not a JavaScript parser, validator, linter, transpiler, or standards-aware printer. It does not understand regular-expression literals, automatic semicolon insertion, modules, JSX, or syntax trees, and it does not report unmatched braces or invalid code. Regex quantifier braces and line-sensitive statements can therefore be changed incorrectly.

How the brace scan works

A single pass over the characters tracks whether the scanner is currently inside a string, template literal, or comment; only outside those regions do an opening brace, closing brace, or semicolon trigger a line break and indent change.

Example

Pasting `function add(a,b){return a+b;}` produces `function add(a,b) {` on its own line, an indented `return a+b;`, and a closing `}` back at the base indentation.

Safe review workflow

Run your project's linter and test suite against the formatted code before committing it, paying particular attention to any regular-expression literal that contains a brace quantifier like `{2,4}`.

Safe workflow and privacy

Keep the original and run your normal formatter, tests, and linter before production use. Formatting happens locally in your browser and pasted code is not uploaded.

Frequently Asked Questions

What does the JavaScript Formatter do?: Format and indent JavaScript code into a clean, readable structure directly in your browser.
Does this JavaScript tool change program behavior?: It only changes layout or removable whitespace. Review minified output before production use when code relies on unusual syntax.
Is my code uploaded?: Processing is local and your code is never uploaded.

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