Prettier

What is Prettier?

Prettier is an opinionated code formatter that enforces a consistent style by parsing your code and re-printing it with its own rules. Unlike traditional linters that only flag issues, Prettier automatically rewrites your code to follow best practices for indentation, line length, quotes, and more.

Originally created for JavaScript, Prettier now supports many languages including TypeScript, HTML, CSS, JSON, Markdown, and more. It has become the industry standard for code formatting in modern web development.

Why Format Code in the Browser?

Most online code formatters send your code to their servers for processing. This poses a security risk—your proprietary code, API keys embedded in configs, or sensitive business logic could be logged or intercepted.

Utiliti runs Prettier entirely in your browser using WebAssembly. Your code never leaves your device, making it safe to format:

• Proprietary Source Code: Format code from private repositories without exposure
• Configuration Files: Safely beautify configs that may contain sensitive values
• Client Projects: Work with client code without violating NDAs or security policies

Supported Languages

Our Prettier integration currently supports the most common web development languages:

• HTML: Format HTML markup with proper indentation and attribute alignment
• TypeScript: Format TypeScript and JavaScript code with consistent styling
• CSS: Beautify stylesheets with organized properties and proper nesting

How to Use

1. Select your language: Choose HTML, TypeScript, or CSS from the dropdown menu.
2. Paste your code: Enter or paste the code you want to format in the input box.
3. Click Format: Your code will be instantly formatted according to Prettier's rules.
4. Copy the result: Use the copy button to grab your formatted code.

Why Use Prettier?

Prettier eliminates debates about code style in your team. By adopting an opinionated formatter, you get:

• Consistency: Every file follows the same formatting rules, regardless of who wrote it
• Productivity: Stop wasting time manually formatting code or arguing about style
• Cleaner Diffs: Consistent formatting means pull request diffs show only meaningful changes
• Easier Onboarding: New team members can write correctly-formatted code immediately

Prettier vs ESLint

While both tools improve code quality, they serve different purposes. ESLint catches bugs and enforces coding patterns (like avoiding unused variables), while Prettier handles purely stylistic concerns (like indentation and line length). Many teams use both together—ESLint for code quality and Prettier for formatting.