JavaScript Beautifier & Formatter

Beautify, minify, and validate JavaScript code instantly. Clean up messy scripts with custom indentation. All processing happens in your browser — no uploads.

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Beautify JS

Transform minified or messy JavaScript into clean, readable code with consistent indentation, spacing, and line breaks.

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Minify JS

Strip whitespace, comments, and unnecessary characters to reduce JS file size for faster page load times.

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Validate JS

Check JavaScript for syntax errors — unmatched brackets, braces, parentheses, and unterminated strings.

How It Works

Paste your JavaScript into the Input panel and choose a mode — Beautify, Minify, or Validate. The output updates instantly as you type.

  • Beautify — formats JS with consistent indentation, line breaks after semicolons and braces, and proper spacing around operators. Choose 2, 4, or 8 spaces.
  • Minify — removes all whitespace, comments, and redundant characters to produce the smallest possible output.
  • Validate — checks for structural errors: mismatched brackets {} [] (), unterminated strings, and unclosed block comments.

All processing runs entirely in your browser — your code never leaves your device.

Common Use Cases

codeDevelopment & Debugging

  • • Unminify and read third-party or bundled JS files
  • • Format copied snippets from browser DevTools
  • • Validate JS before deploying to production
  • • Clean up auto-generated or obfuscated code

rocket_launchPerformance & Production

  • • Minify scripts to reduce HTTP payload size
  • • Check file size before and after minification
  • • Prepare inline scripts for HTML embedding
  • • Format API response scripts for readability