Code Formatter
Format and beautify JavaScript, TypeScript, HTML, CSS, and Python code online with Prettier engine.
How do I use Code Formatter?
Select your target programming language (JavaScript, TypeScript, Python, HTML, or CSS) or pick one of the dedicated language presets.
Configure indentation preferences: Tab Width (2 Spaces, 4 Spaces, or Tabs), Semicolons toggle, and Quote Style (Double or Single quotes).
Paste your unformatted or minified source code into the left Input Code editor, or click 'Load Sample' to test with realistic snippet templates.
Click 'Format Code' to parse and pretty-print your code, then copy or download the clean output with the correct file extension.
What features does Code Formatter offer?
Prettier 3.x Standalone AST engine running 100% locally in your browser memory
Multi-language support covering JavaScript (Babel), TypeScript, Python (PEP 8), HTML, and CSS
Dedicated programmatic presets for TypeScript Formatter and Python PEP 8 Formatter
Configurable Tab Width (2 spaces, 4 spaces, hard tabs), quote normalization, and semicolon control
Zero server uploads: proprietary enterprise code and API keys never leave your device
Supported Languages, Parsers & Default Style Standards
Each language uses a deterministic parser or indentation engine tailored to industry style guides.
| Language | Engine / Standard | Default Indent | Extension |
|---|---|---|---|
| JavaScript / JSX | Prettier Babel AST Parser | 2 Spaces | .js |
| TypeScript / TSX | Prettier TypeScript AST Parser | 2 Spaces | .ts |
| Python | PEP 8 Block Indentation Engine | 4 Spaces | .py |
| HTML5 | Prettier HTML / DOM Parser | 2 Spaces | .html |
| CSS / SCSS | Prettier PostCSS Parser | 2 Spaces | .css |
How is Code Formatter used in real-world workflows?
De-minifying Production Bundles & Snippets
Unpack single-line JavaScript, TypeScript, or CSS snippets copied from browser DevTools or third-party documentation into readable, properly indented source code.
Standardizing Code Before Pull Requests
Normalize quote styles, trailing semicolons, and indentation across TypeScript or Python scripts when working on machines without a local Node.js or Prettier setup.
Formatting Code for Technical Blogs & Documentation
Clean up code examples across multiple languages to ensure consistent 2-space or 4-space alignment before embedding them in Markdown docs.
Frequently Asked Questions about Code Formatter
Is my source code uploaded to remote servers?
No! Code formatting executes 100% locally in your browser memory using Prettier standalone plugins. Your proprietary source code and business logic are never transmitted over the network.
Does it format minified JavaScript, TypeScript, or CSS?
Yes. Prettier parses minified single-line code into an Abstract Syntax Tree (AST) and reprints it from scratch into clean, human-readable lines.
Can I use dedicated URLs for TypeScript or Python formatting?
Yes! You can jump directly to our TypeScript Formatter (/tools/typescript-formatter) or Python PEP 8 Formatter (/tools/python-formatter) with pre-configured language defaults.
Is this online code formatter free without limits?
Yes. JoyTools provides unlimited client-side code formatting with zero usage caps, no watermarks, and no account registration.
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