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JavaScript Formatter

Paste minified or messy JavaScript and turn it into readable indentation while preserving strings, template literals, and comments as much as possible.

Coding Waiting for result
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Coding

Formatted output

Review the result, then copy it or download a .js file.

Syntax check

Syntax looks valid

Code summary

Browser formatter note

Input lines

2

Output lines

13

Characters

195 / 168

Minify saving

0.6%

Functions

1

Declarations

2

Source JavaScript

Paste minified code, messy line breaks, or a small snippet.

Formatted output

Review the result, then copy it or download a .js file.

function greet(name) {
  const message="Hello, "+name;
  if(name) {
    console.log(message);
}
  return message;
}
const users=["Ada",
"Linus",
"Grace"].map((name)=>({
  name,
  active:true
}));

Review checklist

  • Check for secrets or tokens before running formatted code.
  • Review regexes, template literals, and JSX-heavy code carefully.
  • For production code, run your project tests and lint rules after formatting.

Browser formatter note

Use this tool for quick cleanup and review. For team projects, treat ESLint, Prettier, and TypeScript builds as the final source of truth.

Make JavaScript easier to review

The formatter runs in your browser and does not send code to a server. It uses braces, semicolons, commas, and comments to create readable lines and indentation.

Usage notes

  • Strings, template literals, line comments, and block comments are preserved where possible.
  • Braces and semicolons create new lines, then indentation is recalculated.
  • Syntax checking uses the browser JavaScript parser for ordinary script code.

Frequently asked questions

Is this a full Prettier replacement?expand_more

No. It is a practical browser formatter without external packages. Use a project formatter for complex production code.

Is my code uploaded?expand_more

No. Formatting, minifying, syntax checking, and copying happen in the browser.

Can import/export fail syntax check?expand_more

Yes. The check uses the Function parser, so module-only syntax can fail even when the formatted output is useful.

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