JavaScript Beautifier

Format and beautify JavaScript code online with clean indentation and proper spacing. Paste JS and get readable, formatted output for better code readability.

Input

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Output

Output will appear here...

What is JavaScript Beautifier

Last reviewed: April 18, 2026

JavaScript is the programming language of the web, running in every modern browser and powering most interactive frontends and Node.js backends.

JavaScript Beautifier is an online tool that helps you format and beautify JavaScript.

It reformats javaScript so the pasted content is easy to scan, diff, and share, no manual whitespace cleanup required.

Why use it

Make javaScript easier to read, review, and debug.
Standardize javaScript spacing and structure before sharing or committing output.
Clean up pasted javaScript payloads from logs, APIs, or config files faster.
Avoid manual javaScript formatting work when you need copy-ready output.

Example (before/after)

Before formatting

const total=items.reduce((sum,item)=>sum+item.price,0);console.log(total);

After formatting

const total = items.reduce((sum, item) => {
  return sum + item.price;
}, 0);

console.log(total);

Common errors

Invalid syntax

The tool cannot process input that already contains broken syntax or malformed structure.

Fix: Check the pasted content first and correct the syntax error closest to the reported failure point.

Incomplete pasted input

Partial snippets often fail when opening and closing characters are missing.

Fix: Paste the full block or file so the tool can evaluate the complete structure.

Wrong content type

Formatting or validating the wrong format produces misleading errors.

Fix: Make sure the content matches the tool you are using before processing it.

FAQ

Can I use JavaScript Beautifier on mobile?

Yes. JavaScript Beautifier is responsive and works on phones, tablets, and desktops. Copy-to-clipboard and download actions are wired for touch devices too.

How do I export the result from JavaScript Beautifier?

Use the copy-to-clipboard button or the download action on the output panel to move the result straight into your editor, ticket, or build pipeline.

When should I use JavaScript Beautifier instead of a CLI or library?

Reach for JavaScript Beautifier when you need to format and beautify JavaScript for a quick check, debug session, code review, or ticket comment — a CLI or library is better for scripted pipelines, but JavaScript Beautifier removes the setup cost for one-off work.

Does JavaScript Beautifier work offline after the page loads?

Most of the processing is client-side, so once the page has loaded you can keep using JavaScript Beautifier even if your connection drops — unless the tool explicitly hits a backend API for data it can't compute locally.

What does JavaScript Beautifier do?

Format and beautify JavaScript code online with clean indentation and proper spacing. Paste JS and get readable, formatted output for better code readability. Use it when you need a faster browser-based way to format and beautify JavaScript.

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