JavaScript Beautifier

Paste minified or messy JavaScript and instantly get clean, indented, syntax-highlighted output. Also flags common code quality issues like var usage, loose equality, and leftover console.log calls.

Indent: 2 spaces 4 spaces Tabs

Paste your JavaScript above and click Beautify JS to see the result.

About the JavaScript Beautifier

This free online JavaScript beautifier (also called a JS formatter or JS pretty printer) takes minified, obfuscated, or poorly formatted JavaScript and reformats it with consistent indentation, spacing, and line breaks — making it readable and maintainable. It also runs a lightweight linter to flag common code quality issues.

Features

Syntax highlighting — keywords, strings, numbers, comments, regex, operators
Choose between 2-space, 4-space, or tab indentation
Correctly handles template literals, regex literals, and multi-line strings
Preserves single-line and block comments
Code quality hints — flags var, loose equality, console.log, debugger, eval()
Copy to clipboard or download as a .js file
100% client-side — your code never leaves your browser

How to use

Paste your JavaScript into the input box (or click Sample to load an example).
Select your preferred indentation style.
Click Beautify JS to format.
Review any code quality hints shown above the output.
Copy the result or download it as a .js file.

Code quality hints

var — use let or const instead; var has function scope and hoisting which can cause subtle bugs.
Loose equality — == and != perform type coercion; use === and !== for predictable comparisons.
console.log — useful during development but should be removed before deploying to production.
debugger — pauses execution in DevTools; always remove before shipping.
eval() — executes arbitrary code strings; a serious security risk that should be avoided entirely.