The OpenAPI Specification (OAS) is a framework to build applications that interact with REST APIs. The specification defines how to communicate with an API, what information can be requested, and what information can be returned.
An OpenAPI file describes an API by including:
Endpoints: which are available (/users) and operations on each (GET /users, POST /users)
Authentication methods
Operation parameters for each operation (Input and output)
Contact information, terms of use, license, and other information
Why use an OpenAPI Specification?
Single point of truth - The OAS allows the import of API definitions into API clients for manual testing and ensures each piece of the system can be verified against the specification
Documentation - OAS makes it much easier to generate API documentation automatically.
De facto industry standard- OpenAPI is the current de facto industry standard for API definition. This means that any user can access services from an API using this specification without any extra setup.
Are you currently using OpenAPI specifications in your projects? If yes, What tools do you find most effective for working with OpenAPI specs, and how do they help streamline your development process?