OpenAPI Specification

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The OpenAPI Specification (OAS, formerly Swagger Specification) defines a standard, language-agnostic description format for HTTP APIs, typically written in YAML or JSON. 

An OpenAPI file allows you to describe your entire API, so that users can understand the capabilities of the service without access to its source code, or through network traffic inspection. OpenAPI Specifications typically including available endpoints (/users), operations on each endpoint (GET /users, POST /users) and operation parameters (input and output for each operation).
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