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The OpenAPI Specification, previously known as the Swagger Specification, is a specification for a machine-readable interface definition language for describing, producing, consuming and visualizing web services. [1]
Shortly after Swagger was created, alternative structures for describing HTTP APIs were introduced, the most popular being API Blueprint in April 2013 and RESTful API Modeling Language (RAML) in September 2013. While these competing products had stronger financial backing than Swagger, they initially focused on different use cases from Swagger ...
There are two previous major description languages: WSDL 2.0 (Web Services Description Language) and WADL (Web Application Description Language). Neither is widely adopted in the industry for describing RESTful APIs, citing poor human readability of both and WADL being actually unable to fully describe a RESTful API.
An example of a popular web API is the Astronomy Picture of the Day API operated by the American space agency NASA. It is a server-side API used to retrieve photographs of space or other images of interest to astronomers, and metadata about the images. According to the API documentation, [15] the API has one endpoint:
For example, the ability to create an account on an external site/app using your Facebook credentials is made possible using Facebook's open API. Many large technology firms, such as Twitter, LinkedIn and Facebook, allow the use of their service by third parties and competitors .
FastAPI automatically generates OpenAPI documentation for your APIs. This documentation includes both Swagger UI and ReDoc, which provide interactive API documentation that you can use to explore and test your endpoints in real time.
MuleSoft originally started using Swagger (now OpenAPI Specification), but decided it was best suited to documenting an existing API, not for designing an API from scratch. RAML evolved out of the need to support up-front API design in a succinct, human-centric language [ 9 ]
Example-centric programming is an approach to software development that helps the user to create software by locating and modifying small examples into a larger whole. That approach can be helped by tools that allow an integrated development environment (IDE) to show code examples or API documentation related to coding behaviors occurring in the IDE.