From Designing APIs with Swagger and OpenAPI by Joshua S. Ponelat

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Customer-facing and internal APIs have become the most common way to integrate the components of web-based software. Using standards like OpenAPI, you can provide reliable, easy-to-use interfaces that allow other developers safe, controlled access to your software. Designing APIs with Swagger and OpenAPI is a hands-on primer to properly designing and describing your APIs using the most widely-adopted standard.