JavaScript Formatter & Beautifier
Clean, readable JavaScript with custom indentation, minification, and safe browser execution.
- Runs in your browser
- Free, no signup
Formatting and syntax validation execute entirely in your browser — your JavaScript code is never uploaded or executed.
Writing clean, readable JavaScript is essential for code maintainability, team collaboration, and debugging minified production bundles. This online JavaScript formatter translates compressed or unformatted code into structured, evenly indented scripts.
The tool respects object literals, arrow functions, template strings, comments, and regex literals. It provides instant syntax validation and allows one-click switching between 2-space, 4-space, or tab indentation.
How to use this tool
- Paste your JavaScript or ECMAScript code into the input editor or click "Load Sample".
- Select your preferred indentation (2 spaces, 4 spaces, or Tab) in the options bar.
- Click "Format / Beautify" to structure the code, or "Minify" to produce compact production code.
- Check the status bar for syntax validation results, then copy the result or download as a .js file.
Safe Token and Literal Preservation
Naive JavaScript formatters often break template literals, regex patterns, or string quotes containing escaped characters. ToolDuck protects strings, comments, and regular expressions during formatting.
Code is strictly formatted as text and is never executed by the browser, safeguarding against unintended script execution.
Frequently asked questions
Does this tool support modern ES6+ syntax?
Yes. The formatter supports arrow functions, async/await, template literals, destructuring, modules, and class declarations.
Is submitted JavaScript code executed in my browser?
Never. Syntax validation uses non-evaluating parser constructs. Your code is parsed strictly as data and is never executed.