Microsoft has long embraced the OpenAPI Specification (formerly known as Swagger) for describing APIs, and it's now taking that support to the next level with a new online resource.

OpenAPI DevTools detects this and automatically generates the OpenAPI specification. Let's click 'Download'. Automatically generated OpenAPI specification data can be downloaded in JSON format.

Postman joins the OpenAPI Initiative, the consortium of industry experts focused on evolving and promoting the OpenAPI Specification (OAS) ...

Take advantage of the built-in support for OpenAPI in ASP.NET Core to automatically document your HTTP endpoints. Minimal APIs are supported too.

The OpenAPI Specification v3 is a community-driven open specification designed to standardize how REST APIs are written and used.

Support for OpenAPI, a JSON-native standard for online API documentation originally incorporated in the SIF Data Model Specification (New Zealand), has undergone substantial updates in version 3.6.1.