They are language-agnostic, so you can benefit from them no matter what language you choose. An application programming interface can be synchronous or asynchronous. By using the OpenAPI 3 specification, you and other government organisations will be consistent in the way that you describe your RESTful APIs. You can use OpenAPI 3 to automatically generate accurate up to date API reference documentation, regardless of the programming language an API is written in.
The specification can also help you to validate, version, maintain and update this generated documentation. The role of APIs is even greater if we look at it not only from the software development angle but also from the business collaboration angle. These machine-readable interfaces for resource exchange are like delivery services that work under the hood and enable that needed technological connectivity.
To allow use of a different default $schema value for all Schema Objects contained within an OAS document, a jsonSchemaDialect value may be set within the OpenAPI Object. If What is API this default is not set, then the OAS dialect schema id MUST be used for these Schema Objects. The value of $schema within a Schema Object always overrides any default.
API definitions can be used to generate API documentation, code samples, and SDKs automatically. A few examples of tools that generate API documentation (static and interactive) from an API definition file are SwaggerHub and Swagger Inspector. A few examples of tools that can automatically generate sample code and SDKs from API definitions include REST United and SwaggerHub. In some ways, the OpenAPI 3.0.1 document is also API documentation, but an API specification explains how the API behaves and what to expect from the API.