What are the different versions of OpenAPI?

What are the different versions of OpenAPI?

OpenAPI has several versions, with the most notable being 2.0 and 3.0. Version 2.0, also known as Swagger, introduced a standard way to describe REST APIs. Version 3.0 brought significant improvements, including better support for callbacks, links, and content negotiation.

What are the key differences between OpenAPI 2.0 and 3.0?

Key differences include the introduction of the 'components' section in 3.0 for reusable definitions, improved parameter handling, and support for callbacks and links, which enhance API interactions.

Is OpenAPI 3.0 backward compatible with 2.0?

No, OpenAPI 3.0 is not fully backward compatible with 2.0. While some elements are similar, there are significant changes in structure and features that require adjustments when migrating.

Can I use OpenAPI for non-REST APIs?

Yes, while OpenAPI is primarily designed for REST APIs, it can also be adapted for other types of APIs, but it may not fully capture all functionalities.