Are you providing a set of Web-Services, and would like to ease on your users to consume your services?
Are you tierd of implementing over and over long and repetetive input validation checks?
Are you consuming services and are tierd of coding repetetively clients that abstract the network layer into APIs?
Open API Spec is a specification that aims defines how to describe in a standard machine-validatable way all the communication with a web-service. Given such a well-formed description - many of the pains mentioned above can be lifted away.
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