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JS Formatter

JavaScript code formatting

Input
Paste JavaScript code here...
Output
Result will appear here...

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Technical reference

Beautify JavaScript code locally in your browser with configurable indent style, brace placement, wrap length, and newline preservation. Features a syntax-highlighted editor with real-time validation.

Core features

  • One-click beautify with space/tab indent and configurable width (1-8).
  • Brace style options: collapse, expand, end-expand, or none.
  • Configurable wrap line length, preserved newlines count, space in parens, and chained method breaks.
  • Syntax-highlighted code editor with real-time error validation and line numbers.
  • Swap output to input for iterative adjustments.

Example: before and after

Beautify only changes whitespace and line breaks, never modifying code logic. All option changes trigger automatic reformatting.

javascript
function foo(a,b){return a+b;}

function foo(a, b) {
  return a + b;
}

Limits

  • Based on the js-beautify engine; does not support experimental syntax like top-level await in ES modules.
  • Comments are preserved as-is, not removed.
  • Minify mode is not available; only beautify is supported.

Frequently asked questions

Will beautify change my code logic?

No. Beautify only adjusts whitespace, line breaks, and indentation. It never modifies code logic, variable names, or comments.

Does it support TypeScript?

Currently only JavaScript syntax highlighting and beautify are supported. TypeScript type annotations may not be parsed correctly.