Code Formatter for Web Developers — JS, TypeScript, CSS, HTML in One Browser Tool

Web developers work with at least four languages every day: JavaScript, CSS, HTML, and JSON. Often TypeScript and GraphQL too. Managing formatting consistency across all of them typically means Prettier in your IDE — but when you're outside your IDE, you need something that works in a browser without setup.

This page covers how to use the free online code formatter as a web developer's quick-access browser tool, with notes on the specific formatting each language receives.

All Your Web Languages in One Formatter

Switch between languages using the dropdown. Each gets the right formatting treatment:

Language	What gets formatted	Common use
JavaScript	Indentation, quotes, semis, line wrap, arrow parens	All JS files, JSX components
TypeScript	Same as JS + type annotations, interfaces, generics	TS/TSX files, React with TS
CSS	Property spacing, selector formatting, rule separation	Stylesheets, design tokens
HTML	Nesting, attribute formatting, inline vs block elements	Templates, email HTML, snippets
JSON	Object/array indentation, key sorting (none — preserves order)	Config files, API responses
GraphQL	Query/mutation/schema formatting, field alignment	SDL files, query strings

Workflow — When Web Developers Reach for the Browser Formatter

Common scenarios where the browser formatter is the right tool:

• Code review in GitHub — you see badly formatted code in a PR. Copy it to the formatter, clean it up, understand the structure.
• Client/colleague code — they send you a JavaScript snippet or HTML block in Slack or email. Format it before reading.
• Documentation or blog posts — you're writing a tutorial. Format all code examples to look professional before pasting.
• Quick JSON inspection — you got an API response back from curl or Postman. Paste the JSON and expand it.
• New machine without setup — you're working on a machine where Node.js and your usual tools aren't installed yet.
• Borrowing someone's computer — you need to format some code quickly without installing anything.

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Matching Your Project's Prettier Configuration

The formatter's options map directly to Prettier's configuration file options:

• Tab Width → tabWidth in .prettierrc
• Quotes → singleQuote: true/false
• Semicolons → semi: true/false
• Trailing Commas → trailingComma: "all"/"es5"/"none"
• Print Width → printWidth

Match these to your project's config, and the browser output will be identical to what running prettier --write locally would produce. No guessing, no drift.

Setting Up Prettier Locally vs Using the Browser Formatter

Use the browser formatter for:

• Quick one-off formatting outside your IDE
• Formatting code you received from someone else
• Working on a machine without your dev environment

Set up Prettier locally (via npm) for:

• Format-on-save in VS Code or WebStorm
• Pre-commit hooks with lint-staged
• CI/CD formatting checks
• Team-wide consistency enforced automatically

The browser formatter and local Prettier are complementary — same engine, different convenience tradeoffs. See our VS Code Prettier setup guide for the local setup.

Frequently Asked Questions

Can I format multiple files at once?

No. The browser formatter processes one code snippet at a time. For bulk formatting across an entire project, use the Prettier CLI locally: npx prettier --write "src/**/*.{js,ts,css,html}"

Does it work offline?

Once the page has loaded, the formatter runs entirely in your browser. If you have the tab open, it will work without an internet connection (since processing is local). Refreshing the page requires a connection.

Is there a VS Code extension for this?

The formatter runs in a browser. For VS Code, use the official Prettier extension (prettier.io/docs/editors), which uses the same formatting engine natively in your editor.