JavaScriptフォーマッター
Format JavaScript online with readable indentation while preserving source text and helping you review code. 日本語 locale.
Make HTML structure easier to inspect
This tool presents JavaScript in a readable layout by adding line breaks, spaces, and consistent indentation. It is useful for compact so...
Formatting is not HTML validation
A JavaScript formatter reads tokens, braces, arrays, objects, functions, control flow, strings, comments, and template literals, then emi...
How to format HTML
- Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
- Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
Formatting method
- Read markup structure
The formatter tracks delimiters, strings, comments, template literals, and nesting depth. It places statements and blocks on readable lin...
- Apply indentation
The formatter tracks delimiters, strings, comments, template literals, and nesting depth. It places statements and blocks on readable lin...
- Preserve content
The formatter tracks delimiters, strings, comments, template literals, and nesting depth. It places statements and blocks on readable lin...
Exact parser recovery, optional-tag handling, whitespace policy, embedded-language behavior, and error wording should be confirmed in a l...
Read the formatted result
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
よくある間違い
Common mistakes include pasting TypeScript or JSX as plain JavaScript, confusing formatting with linting, losing comments, or submitting ...
Common mistakes include pasting TypeScript or JSX as plain JavaScript, confusing formatting with linting, losing comments, or submitting ...
制限と特殊なケース
Formatting cannot recover the author’s intent, repair every syntax error, execute code, or guarantee compatibility with a selected ECMASc...
Formatting cannot recover the author’s intent, repair every syntax error, execute code, or guarantee compatibility with a selected ECMASc...
Examples
Format JavaScript online — 1
Does formatting validate JavaScript?
Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
Format JavaScript online — 2
Does it execute the code?
Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
Format JavaScript online — 3
Are comments preserved?
Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
Format JavaScript online — 4
Can it format minified code?
Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
Format JavaScript online — 5
Does it support modern syntax?
Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
Format JavaScript online — 6
Does it change program logic?
Paste JavaScript, check the selected language, run the formatter, inspect the result, and compare it with the original. Keep the original...
A useful result has stable indentation, readable blocks, intact strings and comments, and a clear separation between statements. Added wh...
Frequently asked questions
Does formatting validate JavaScript?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
Does it execute the code?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
Are comments preserved?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
Can it format minified code?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
Does it support modern syntax?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
Does it change program logic?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
How should I verify the output?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.
When should I use a linter?
No. A formatter arranges source text. Use the parser, linter, tests, and build system required by the project to verify syntax and behavior.