Scalar

Scalar is an open-source platform designed to create a modern developer experience for your APIs. It takes your existing OpenAPI specification and instantly generates beautiful, world-class documentation. More than just static pages, these docs come with a built-in interactive playground, which doubles as a full-featured API client. This allows your users to discover, understand, and test your API endpoints without ever leaving the documentation, significantly reducing their onboarding time.

The platform is built with flexibility and developer workflows in mind. Key features include:

• Complete Customization: Fully brand your documentation with themes, custom CSS/JS, and your own domain.
• Git & Markdown Sync: Keep your documentation version-controlled and living alongside your code.
• Integrated API Client: Allow users to make real API calls directly from the documentation.
• Broad Framework Support: Seamlessly integrate with popular frameworks like NestJS, FastAPI, Laravel, Express, and many more.

Scalar also offers a powerful, offline-first API client for all major platforms (Web, macOS, Linux, Windows), ensuring you can work from anywhere.