OperationId

OperationId is a key concept in OpenAPI, a widely-used API description format. It is a unique identifier for an operation within an API, and is used to reference the operation from other locations in the API definition.

The OperationId is a string value that is provided as part of the OpenAPI definition, and is used to identify a specific operation or endpoint within the API. It can be used to reference an operation from other parts of the API definition, such as from thepaths section where multiple operations share the same endpoint.

The OperationId serves several purposes. Firstly, it provides a unique identifier for each operation, which can be used by tools and frameworks to differentiate between operations. Secondly, it enables the use of relative references within the API definition, making it easier to manage and maintain large API definitions.

In terms of syntax and usage, the OperationId is typically expressed as a string value, without any special characters or reserved keywords. It is not the same as the HTTP method used in the operation (such as GET or POST), although the two can be related.

The OperationId is also used in Swagger UI and other tooling, to render the API endpoints in a human-readable format. It provides a clear and concise way to refer to the operations within an API, making it easier to understand and interact with the API.

By providing a unique and consistent identifier for each operation, the OperationId facilitates a more structured and organized approach to API design and development.