Scalar is a modern alternative to Swagger UI for rendering OpenAPI specs. It produces clean, readable API docs with a built-in API client for testing requests. The UI is significantly more polished than default Swagger UI, with better search, dark mode, and code examples in multiple languages.
Supports OpenAPI 3.x and Swagger 2.0. Available as a CDN script, React/Vue component, or framework middleware (Express, Fastify, Hono, NestJS). The API client works like a lightweight Postman embedded in your docs.
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