OpenAPI

openapis.orgsite

Formerly known as the Swagger Specification, OpenAPI specifcation is the world’s most popular description format for defining Restful APIs.

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Microservices, REST

added

2026-10-10

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1. ▲
   OpenAPI Spec spec.openapis.org

   site category #standards link ↗

   The OpenAPI Specification (OAS) defines a standard, language-agnostic interface to HTTP APIs.

2. ▲
   OpenAPI (ex.Swagger) (⭐31k) github.com

   tool category #integration link ↗

   A language-agnostic specification for creating RESTful APIs that enables both humans and machines to understand the capabilities of a service without the need for source code or documentation.

   
3. ▲
   libopenapi github.com

   tool category #go link ↗

   Parse, validate, and work with OpenAPI, Swagger, Overlays, and Arazzo specifications.

   
4. ▲
   openapi github.com

   tool category #go link ↗

   Parse, validate, and manipulate OpenAPI, Swagger, Arazzo, and OpenAPI Overlay documents.

5. ▲
   APIs.guru apis.guru

   site category #rest link ↗

   Wikipedia for Web APIs, each API has OpenAPI/Swagger description.

6. ▲
   Site restfulwebapis.org

   site category #opensource-documents link ↗

Microservices › Web API Modeling & Documentation > REST: “The OpenAPI Specification (OAS) provides a consistent means to carry information through each stage of the API lifecycle.”

REST › Standards: “Formerly known as the Swagger Specification, OpenAPI specifcation is the world’s most popular description format for defining Restful APIs.”