Code Formatter

Code Formatter beautifies JavaScript, TypeScript, HTML, CSS, JSON, Markdown, YAML, and common snippets with Prettier options, syntax highlighting, file upload, copy, and download.

Code Formatter workspace and controls

Input Code

Formatted Code

Formatted code will appear here

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What is Code Formatter | Rune

Code Formatter cleans up messy, minified, or inconsistent source code so it is easier to read, review, debug, and paste into a project. The formatter uses Prettier for JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and YAML, with basic indentation cleanup for other supported snippet types.

SERPs for code formatter, code beautifier, JavaScript formatter, HTML formatter, CSS formatter, and JSON formatter show developer intent around quick cleanup, syntax highlighting, file upload, configurable indentation, and copyable output. Rune keeps those controls in one split editor.

Use the language selector for JavaScript, TypeScript, HTML, CSS, JSON, Markdown, YAML, Python, Java, C++, C#, PHP, Go, Rust, Swift, Kotlin, Ruby, SQL, or Bash snippets. Prettier-backed languages include stricter parsing and options such as print width, tab width, semicolons, single quotes, trailing commas, and arrow parens.

For production formatting, keep your repository formatter as the source of truth. This page is most useful for quick cleanup, API response inspection, inherited snippets, docs examples, and readable handoffs.

20+
Languages
Instant
Formatting
Prettier
Powered
Custom
Options

Key Features of Code Formatter

A complete feature set designed for real code formatter workflows

Prettier Formatting

Format JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and YAML with Prettier parsers.

Formatting Options

Configure print width, tab width, tabs, semicolons, single quotes, trailing commas, bracket spacing, and arrow parens where supported.

Fast Beautify

Paste minified or messy code and generate readable output with consistent indentation.

Syntax Highlighting

Formatted code is displayed with full syntax highlighting for easy reading.

Quick Copy

Copy formatted code to clipboard with one click for use in your projects.

File Upload

Upload common source files and auto-select a language from the file extension when possible.

How to Use Code Formatter

No setup needed, just 3 steps to your result

01

Paste Your Code

Paste minified, messy, or unformatted code into the input area.

02

Select Language

Choose the programming language for proper formatting rules and syntax.

03

Copy Formatted Code

Copy the formatted code to your clipboard or download it with the selected extension.

Rune pro tipsPro Tips

  • Use 2-space indentation for JavaScript/TypeScript and 4-space for Python to follow community conventions.
  • Format JSON before debugging API responses to quickly spot structure issues.
  • Use the formatter to standardize code before submitting pull requests.
  • Minified code can be beautified to make it readable for debugging purposes.

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Frequently Asked Questions

Quick answers for Code Formatter users

What languages are supported?

The selector includes JavaScript, TypeScript, HTML, CSS, JSON, Markdown, YAML, Python, Java, C++, C#, PHP, Go, Rust, Swift, Kotlin, Ruby, SQL, and Bash.

Which languages use Prettier?

JavaScript, TypeScript, HTML, CSS, JSON, Markdown, and YAML use Prettier parsers. Other selected languages use simpler indentation cleanup and syntax highlighting.

Can I customize the formatting style?

Yes. For Prettier-backed languages you can adjust print width, tab width, tabs, semicolons, single quotes, trailing commas, bracket spacing, and arrow parens.

Does it work with minified code?

Yes. It can expand minified JavaScript, CSS, HTML, JSON, Markdown, and YAML when the input syntax is valid.

Can I format partial code snippets?

Yes, you can format complete files or partial code snippets. The formatter handles both gracefully.

Is there a code length limit?

No strict limit. The formatter handles large files efficiently in your browser, though very large files may take a moment to process.

Still need help?

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