Redoc OpenAPI Documentation

Redoc is an open-source tool for generating beautiful, interactive, and responsive API documentation from OpenAPI (formerly Swagger) specifications. Created by Roman Hotsiy in 2015, with over 24,000 stars as of 2026, Redoc is widely used by API-first companies for publishing developer documentation. Key features include: OpenAPI 3.1 support (full support for OpenAPI 3.1, 3.0, and Swagger 2.0 specifications with automatic rendering of paths, parameters, request and response bodies, security schemes, and callbacks), three-panel layout (left navigation, middle documentation with inline examples, and right request and response samples for efficient API browsing), responsive design (mobile-friendly responsive layout that adapts to different screen sizes with collapsible sections), React component (renders as a React component for embedding in existing React applications with customizable theme and layout), standalone HTML (single HTML file output that can be served from any static file server or CDN without JavaScript framework dependencies), interactive playground (try-it-out functionality for sending test API requests directly from documentation with configurable server URLs and authentication), search (full-text search across all API endpoints, parameters, and descriptions with highlighted results), theming (customizable colors, fonts, spacing, and layout via theme configuration object with dark mode support), code generation (request examples in multiple languages via payload generators including curl, Python, JavaScript, and Go), server-side rendering (SSR support for initial server-side rendered HTML for SEO and fast initial load), markdown support (full GitHub Flavored Markdown rendering in descriptions with tables, code blocks, and admonitions), and Redocly platform (commercial offering with enhanced features including hosted documentation, versioning, and API registry).