Beautify and format HTML, CSS, JavaScript, JSON, and TypeScript code with Prettier — right in the browser.
| Language | Engine |
|---|---|
| JavaScript / JSX | Prettier + Babel parser |
| TypeScript / TSX | Prettier + TS parser |
| HTML / Jinja | Prettier HTML parser |
| CSS / SCSS / Less | Prettier PostCSS parser |
| JSON | Prettier JSON parser |
Consistent code formatting is a fundamental practice in professional software development. Unformatted code — inconsistent indentation, varying quote styles, long lines — makes collaboration and debugging harder. Formatters like Prettier enforce a consistent style so you can focus on logic, not whitespace.
When everyone on a team uses the same formatter, code reviews focus on logic, not style nitpicks. Prettier is the most widely used auto-formatter in the JavaScript ecosystem.
Properly indented, readable code makes it far easier to spot logic errors, mismatched brackets, and structural problems.
Well-formatted code serves as its own documentation. Other developers (and your future self) can understand the structure at a glance.
Reformatting minified code, API responses, or poorly-indented code from external sources takes one click with a formatter.
Prettier is an opinionated code formatter that supports many languages. It re-prints code from scratch according to its own style rules, ensuring consistent output regardless of input style.
No. Formatting only changes whitespace, indentation, and style — never the logic or execution of your code. The formatted output is functionally identical to the input.
Standard JSON does not support comments. If your JSON contains comments (sometimes called JSONC), remove them before formatting — they'll cause a parse error.
Formatting makes code more readable — it adds indentation, line breaks, and consistent spacing. Minification does the opposite, removing all whitespace to produce the smallest possible file for production use.
The formatter supports HTML, CSS, JavaScript, TypeScript, JSON, GraphQL, and Markdown. It uses Prettier, the industry-standard code formatter, running directly in your browser.
No. Formatting only changes whitespace, indentation, line breaks, and quote style. The code is functionally identical before and after — it runs exactly the same.
The tool uses Prettier 2.8.8 loaded from the jsDelivr CDN. This runs entirely in your browser — no code is sent to any server.
Basic options (tab width, single vs double quotes, semicolons) are available in the settings panel. For full Prettier configuration, use Prettier directly in your code editor with a .prettierrc file.
Consistently formatted code is significantly easier to read, review, and debug — especially when working with others. Most professional development teams enforce a consistent style using an auto-formatter.