FormatPaste

JavaScript Formatter

Paste JavaScript, format it automatically, and copy clean JS output.

All formatters

Input

Don't paste secrets · formatting is not stored

Output

formatted

Free JavaScript formatter

Format JavaScript online in a paste-and-copy workflow

Use this JavaScript formatter for messy snippets, minified functions, copied Stack Overflow code, AI-generated output, or code with accidental line numbers. The formatter runs immediately so the page is the tool.

Format JS snippets

Clean functions, objects, arrays, imports, callbacks, and modern JavaScript syntax.

Remove copied line numbers

Paste code copied from docs, chats, or screenshots and strip common line number artifacts.

Copy-ready JavaScript

Keep the flow simple: paste JavaScript, review formatted output, copy it back.

How this JavaScript formatter helps

Before and after formatting

Paste compact, copied, or hard-to-read JavaScript into the input pane. FormatPaste cleans common paste artifacts first, then formats the code into readable output that is easier to scan, debug, share, or copy into your editor.

Common JavaScript formatting use cases

Use it for quick snippets from documentation, AI chat output, Stack Overflow answers, config examples, API responses, old files, minified blocks, and code that picked up line numbers or markdown fences while being copied.

Safe paste reminder

FormatPaste is built for speed, but you should avoid pasting passwords, API keys, tokens, private keys, recovery codes, customer data, or other secrets into any online formatter. Use local tools for sensitive code.

JavaScript formatting example

Before

const total=items.filter(i=>i.active).map(i=>({...i,price:i.price*1.2})).reduce((s,i)=>s+i.price,0);if(total>100){notify('Big order',{total})}

After

const total = items
  .filter((i) => i.active)
  .map((i) => ({ ...i, price: i.price * 1.2 }))
  .reduce((s, i) => s + i.price, 0);
if (total > 100) {
  notify("Big order", { total });
}

When to use a JavaScript formatter

Unminify JavaScript to read it

Minified bundles and one-line snippets are impossible to follow. Formatting breaks long method chains onto separate lines and indents each block, so you can trace what a function does. It cannot restore original variable names that a minifier shortened.

Tidy code from AI chats and Stack Overflow

Snippets copied from answers and chat tools come with mixed quotes, missing semicolons, and uneven indentation. Formatting gives them the same style as the rest of your project before you paste them in.

Make code reviews easier

Consistent formatting means diffs show real changes, not whitespace noise. Format a snippet before sharing it in a pull request comment, a ticket, or documentation.

Find syntax errors faster

If a bracket or brace is missing, the formatter reports a parse error instead of guessing. That makes it a quick check for snippets that will not run.

More free online formatters

Privacy · Security

JavaScript Formatter FAQ

How do I format JavaScript online?

Paste JavaScript into the input pane and the formatted JS appears automatically in the output pane.

Can it format minified JavaScript?

Yes. It can expand compact JavaScript into readable multi-line code.

Can it remove line numbers from copied JS?

Yes. FormatPaste removes common leading line numbers before formatting.

Is this JS formatter free?

Yes. It is free to use for quick JavaScript formatting.

Is this a JavaScript beautifier or a Prettier formatter?

Both. Beautifying and formatting mean the same thing here: the code is reprinted with Prettier-style rules, including two-space indentation, double quotes, semicolons, and trailing commas where valid in ES5.

Does it support modern JavaScript and JSX?

Yes. ES modules, async/await, optional chaining, spread syntax, classes, and JSX in React components are all supported.

Will formatting change what my code does?

No. Formatting only changes whitespace, quotes, semicolons, and line breaks. If the input has a syntax error, you get an error message instead of changed code.