Have you ever been frustrated by developing and documenting an HTTP API? When it comes down to defining the HTTP interface between frontend and backend, have you ever had problems specifying the parameters or the shape of the body without misunderstandings? In this talk we’ll introduce you to "Contract Driven Development" (or API Design First approach), a methodology that uses declarative API Contracts to enable developers to efficiently design, communicate, and evolve their HTTP APIs, while automating API implementation phases where possible. In order to implement this methodology, we’ll show you how to develop an API contract using OpenAPI 3 and how you can easily implement the HTTP endpoints using Vert.x Web OpenAPI.
