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Swagger is an open-source software framework backed by a large ecosystem of tools that helps developers design, build, document, and consume RESTful web services. While most users identify Swagger by the Swagger UI tool, the Swagger toolset includes support for automated documentation, code generation, and test-case generation.

Sponsored by SmartBear Software, Swagger has been a strong supporter of open-source software, and has widespread adoption.

Swagger's open-source tooling usage can be broken up into different use cases: development, interaction with APIs, and documentation.

Developing APIs
When creating APIs, Swagger tooling may be used to automatically generate an Open API document based on the code itself. This embeds the API description in the source code of a project and is informally called code-first or bottom-up API development.

Alternatively, using Swagger Codegen, developers can decouple the source code from the Open API document, and generate client and server code directly from the design. This makes it possible to defer the coding aspect.

Interacting with APIs
Using the Swagger Codegen project, end users generate client SDKs directly from the OpenAPI document, reducing the need for human-generated client code. As of August 2017, the Swagger Codegen project supported over 50 different languages and formats for client SDK generation.

Documenting APIs
When described by an OpenAPI document, Swagger open-source tooling may be used to interact directly with the API through the Swagger UI. This project allows connections directly to live APIs through an interactive, HTML-based user interface. Requests can be made directly from the UI and the options explored by the user of the interface.

Swagger has been used in the oGaTe and IIX Gateway (Insurance oGaTe).