Pages with tag Spring Boot

Create a Spring Boot REST API using Swagger/OpenAPI "Generate Swagger OpenAPI REST API documentation for Spring Boot application"

The Swagger tools, and the OpenAPI format, are an excellent way to document REST API's and even to generate client or server stub libraries to ease implementation. The technology serves two purposes -- a) standardized documentation for REST API's, b) generating code from API documentation in several programming languages. An OpenAPI file is fairly simple to write, you declare REST endpoints, describe the parameters and the request type, and then describe responses. It allows you to define complex object models that can be used either as input to a service, or its output.

Unfortunately the Swagger website doesn't have adequate documentation of using the tools. And it proved difficult to find clear straight-forward tutorials showing how to get started. Even the most powerful tool can be hampered if folks are unable to use it.

The following tutorial is a complete demonstration of, starting from scratch, developing a small Spring Boot service using OpenAPI and the Swagger tools. We show how to go from an OpenAPI spec to generated Spring Boot code, and also how to generate an OpenAPI spec from running Spring Boot code. There are several issues with the workflow of generating code from the OpenAPI spec. It's more effective to instead write the service code, and add in the annotations required for the Swagger tools to generate the OpenAPI spec for you.

With the OpenAPI spec it's easy to produce interactive API documentation that programmers can try out directly in their web browser.

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