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JavaScript Formatter

Lay out basic JavaScript structure while keeping pasted code as inert text in your browser.

Conservative layout72 chars
Text only · never executed or rendered
The formatter preserves strings and comments as text.
Formatted JavaScript preview Ready
81 output chars
function welcome(name) {
  const message = "Hello, " + name;
  return message;
}
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How it works & useful details

Structural JavaScript layout

This conservative formatter copies strings and comments verbatim, then lays out braces, semicolons, and indentation. It never evaluates pasted text.

It is useful for basic statement and block layout. It is not a full JavaScript parser or a substitute for an ecosystem formatter: retain your source when exact whitespace around complex syntax, regular-expression literals, or automatic-semicolon-insertion boundaries matters.

Private, bounded text processing

Code and markup stay as inert text in this browser. These tools do not execute JavaScript, render HTML, load URLs, install packages, contact registries, or save what you paste.

Regex patterns are limited to 500 characters and test text to 20,000 characters. Formatters and package inspection accept up to 100,000 characters; exports are capped at 200,000 characters.