Swagger

Swagger is a suite of tools for designing, documenting, testing, and governing APIs across the full lifecycle, including AI-enabled workflows. It centers on API specifications such as OpenAPI, AsyncAPI, and JSON Schema, helping teams build APIs intended for both human developers and AI agents. The suite combines open-source tools with commercial products covering design, documentation, testing, and API discoverability.

The open-source tools include Swagger Editor, which provides browser-based API design with real-time feedback and syntax auto-completion; Swagger UI, which visualizes and lets users interact with API resources; and Swagger Codegen, which generates client libraries, server stubs, and documentation from an OpenAPI Specification. Commercial products include Swagger Studio for API design and governance, with AI-assisted API generation, MCP server creation, automatic linting against internal style guides, a centralized API catalog, in-line commenting, templates and style guides, reusable components, mock API generation, and integrations with version control, CI/CD pipelines, and API gateways. Swagger Portal provides automated API documentation and onboarding guides, with public or restricted visibility, a branded searchable portal, roles and permissions, and multiple rendering options. Contract Testing validates APIs across HTTP, Kafka, and other protocols, orchestrates CI/CD pipelines, and uses AI to generate and maintain tests. Functional Testing supports API regression testing with low-code/no-code test building, version-aware validation, parallel and sequential execution, and centralized test management. Explore enables exploratory testing in the browser with REST and Kafka support, shared Explore Spaces, and OpenAPI generation for services that lack a description.

Swagger is intended for teams of all sizes working on API design, documentation, testing, and governance, including cross-functional teams and enterprise API development. The open-source tools are available directly, while the commercial products are offered through free trials.