Formateur de Code

A tiny, in-browser Prettier playground

Prettier is the de-facto standard for code formatting in the JavaScript world. It enforces a consistent style across files, languages and contributors so teams stop arguing about spaces and semicolons. FreeLabTools wraps Prettier in a zero-setup web UI: paste your code, pick a language, click Format.

Langages supportés

We ship Prettier's official plugins so the output matches what you'd get in any Prettier- configured project:

• JavaScript, TypeScript, JSX / React — modern syntax including ES2024, decorators, optional chaining.
• JSON, JSON5 — compact data, plus the more relaxed JSON5 with comments and trailing commas.
• CSS, SCSS, Less — full stylesheet support with selector grouping.
• HTML — including embedded scripts and styles.
• Markdown — table alignment, list normalization, code fence padding.
• YAML — useful for cleaning Docker, Kubernetes, GitHub Actions configs.
• GraphQL — schema and query formatting.

Performance : pourquoi c'est rapide

Prettier's standalone bundle is small (~85 KB), but each language plugin can be 100-800 KB. Loading them all upfront would slow the first paint. Instead, this page loads plugins on demand: when you pick TypeScript, only the TypeScript plugin downloads. On a typical connection the first format takes about half a second; subsequent ones are instant.

Confidentialité

Everything runs inside the browser tab — Prettier itself executes locally. Your code is never sent to a server. The only network traffic is the (one-time) download of Prettier's public assets from a CDN.

Cas d'utilisation

• Quickly clean up a JSON or YAML file before pasting it into a config.
• Fix the indentation of a snippet from a forum or chat.
• Apply your project's style to one-off scripts without installing Node.
• Teach Prettier defaults to new team members.