JavaScript Formatter & Beautifier
Paste your JavaScript and instantly pretty-print and beautify it with consistent indentation and spacing.
Free, no signup — reformats minified or messy JS in seconds without changing behavior.
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How to Format JavaScript Online
Turn minified or messy JS into clean, readable code in three steps.
Paste Your JavaScript
Drop in minified, single-line, or messy JS code.
Format
Click Format JavaScript to reprint with consistent indentation and spacing.
Copy or Download
Copy the clean JavaScript to your clipboard or download it as a .js file.
// before
function foo(a,b){return a+b;}
// after
function foo(a, b) {
return a + b;
}Preserves Comments
Line and block comments stay exactly where you wrote them.
Modern Syntax Support
Handles arrow functions, template literals, async/await, classes, and more.
Instant Download
Copy to clipboard or download the formatted JS as a .js file in one click.
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Frequently Asked Questions
What does the JavaScript Formatter do?
It tokenizes and reprints your JavaScript with consistent two-space indentation, spacing around operators, and sensible line breaks for blocks, objects, arrays, and method chains.
Does it preserve comments?
Yes. Line and block comments are kept in place, and blank lines in your input are collapsed to at most one blank line in the output.
Does it support modern JavaScript syntax?
Yes, including arrow functions, template literals, destructuring, spread/rest operators, async/await, classes, and switch/case blocks.
Will it change my code's behavior?
No. The formatter only changes whitespace and line breaks for readability — it does not alter logic, rename variables, or transform your code.
Is this free to use?
Yes. The JavaScript Formatter is completely free with no signup, no login, and no limits.
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