About JavaScript Formatter

Format and beautify your JavaScript code for better readability. This free online tool helps you indent and format messy JS code properly.

Normalize JavaScript layout across functions, modules, objects, arrays, expressions, and control-flow blocks.

Key features

  • Formatting purpose Normalize JavaScript layout across functions, modules, objects, arrays, expressions, and control-flow blocks.
  • Supported source Paste JavaScript or ECMAScript module code supported by the parser version used on the page.
  • Style controls Choose indentation and available preferences for semicolons, quotes, trailing commas, wrapping, or brace style.
  • Formatted result The formatted program is easier to review and diff while preserving the parsed program structure.

How to use JavaScript Formatter

Follow this workflow to work with JavaScript source code safely and accurately.

  1. Paste or enter the source Paste JavaScript or ECMAScript module code supported by the parser version used on the page.
  2. Choose formatting rules Choose indentation and available preferences for semicolons, quotes, trailing commas, wrapping, or brace style.
  3. Format the source Run the formatter after the source parses successfully. It will apply presentation rules without intentionally changing the parsed structure.
  4. Review and copy The formatted program is easier to review and diff while preserving the parsed program structure.

Usage tips

  • Run tests after formatting code that depends on automatic semicolon insertion or unusual tagged-template whitespace.
  • Use ESLint for correctness and policy checks; a formatter mainly controls presentation.
  • Select a TypeScript, JSX, Flow, or Vue formatter when the source contains those language extensions.

Frequently asked questions

Normalize JavaScript layout across functions, modules, objects, arrays, expressions, and control-flow blocks.
Paste JavaScript or ECMAScript module code supported by the parser version used on the page.
Choose indentation and available preferences for semicolons, quotes, trailing commas, wrapping, or brace style.
Unsupported proposals, template syntax, or syntax errors can prevent parsing. Formatting does not execute or test the program.