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Code Formatter — Prettier Online

Free online code formatter powered by Prettier. Format JavaScript, TypeScript, HTML, Vue, CSS, SCSS, JSON, YAML, Markdown, and GraphQL with customizable options. No sign-up required.

AI developer workflow fit

Use Code Formatter — Prettier Online while building with AI coding assistants, agents, and LLM workflows: validate generated output, transform payloads, debug integrations, and prepare reliable inputs without leaving your browser.

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What Is Code Formatter?

This tool uses Prettier, the industry-standard code formatter, to automatically format your code according to consistent style rules. Prettier supports JavaScript, TypeScript, HTML, Vue, CSS, SCSS, Less, JSON, YAML, Markdown, and GraphQL. It removes all original styling and enforces a consistent code style, making your codebase easier to read and maintain.

How to Use This Code Formatter

  1. Select the programming language from the dropdown menu.
  2. Paste your unformatted code into the input area, or click Load Sample to try an example.
  3. Adjust formatting options: tab width, print width, semicolons, and quote style.
  4. Click Format Code to format your code using Prettier.
  5. Copy the formatted output with the Copy button.

Common Use Cases

  • Quickly Format Messy Code — Paste code from Stack Overflow, GitHub issues, or chat messages and instantly format it for readability.
  • Standardize Code Style — Ensure consistent formatting across your team by using the same Prettier configuration.
  • Format Config Files — Pretty-print JSON, YAML, and other configuration files for easier editing and review.

FAQ

What problem does Code Formatter — Prettier Online solve?
Free online code formatter powered by Prettier. Format JavaScript, TypeScript, HTML, Vue, CSS, SCSS, JSON, YAML, Markdown, and GraphQL with customizable options. No sign-up required.
Can I use Code Formatter — Prettier Online with AI-generated output?
Yes. It is useful for checking, cleaning, converting, or validating examples produced by AI coding assistants before you rely on them in real projects.
Does this tool upload my data?
The tool is designed to run in the browser whenever possible. Tools that require a backend or AI service are labeled separately.