JS Tools

Online JavaScript Formatter

Format JavaScript with consistent indentation and spacing; readable modern JS.

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How to use

  1. Paste or type your input in the left editor
  2. Adjust options in the toolbar if available
  3. Copy or download the output from the right pane

This free online tool runs entirely in your browser. No sign‑up, no server uploads.

About Javascript Beautifier

Format JavaScript with consistent indentation and spacing; readable modern JS.

The JavaScript beautifier tokenizes your code into a stream of language tokens — identifiers, keywords, operators, strings, comments, and punctuation — using a JavaScript-aware lexer. It then reconstructs the source code by walking the token stream and applying formatting rules: inserting line breaks after statement terminators, indenting block contents, adding spaces around operators, and wrapping long lines. Special rules handle edge cases like for-loop headers, ternary expressions, and chained method calls.

Use the left editor to enter your data. The output updates in real time. You can copy, clear, download, or expand either pane.

Tip: Use the search bar to quickly switch between tools.

Sample JavaScript

function greet(n){return "Hello, "+n}
Example input shown above. Output appears in the right pane instantly.

Why this tool?

FeatureJavascript BeautifierTypical alternatives
Free online toolYesOften yes
Client‑side only (privacy)YesVaries
No sign‑up requiredYesVaries

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FAQs

Can the JavaScript beautifier format minified or obfuscated code?
Yes. The JS beautifier can reformat even heavily minified or webpack-bundled JavaScript into readable code with proper indentation, line breaks, and spacing. While it cannot reverse variable name obfuscation, it restores the code's visual structure.
Does the beautifier handle modern ES6+ syntax?
The beautifier fully supports modern JavaScript including arrow functions, template literals, destructuring, spread operators, async/await, optional chaining, and class syntax. All ES6+ features are properly formatted.
Can I choose between different brace styles?
Yes. You can select between K&R style (opening brace on the same line), Allman style (opening brace on a new line), or other common conventions. The chosen style is applied consistently throughout the entire file.
Does the beautifier format JSX and React code?
The beautifier handles standard JavaScript. JSX syntax (HTML-like tags within JS) will be formatted, but for optimal React/JSX formatting, a Prettier-compatible formatter may produce better results for component markup.
Will formatting change how my JavaScript executes?
No. The beautifier only adds whitespace, line breaks, and indentation. It does not modify any tokens, operators, or statements. Your code will execute identically before and after formatting.