# Document an API

- [OpenAPI](https://gitbook.com/docs/api-references/openapi.md): Add an OpenAPI spec to a page and let your users test endpoints right on the page with interactive blocks.
- [Add an OpenAPI specification](https://gitbook.com/docs/api-references/openapi/add-an-openapi-specification.md): Learn how to add and update an OpenAPI specification in GitBook application or from CLI
- [Insert API reference in your docs](https://gitbook.com/docs/api-references/openapi/insert-api-reference-in-your-docs.md): Insert complete API reference from your OpenAPI spec or pick individual operation or schemas
- [Guides](https://gitbook.com/docs/api-references/guides.md)
- [Structuring your API reference](https://gitbook.com/docs/api-references/guides/structuring-your-api-reference.md): Learn how to structure your API reference across multiple pages with icons and descriptions
- [Adding custom code samples](https://gitbook.com/docs/api-references/guides/adding-custom-code-samples.md): Learn how to configure custom code samples to display alongside your API endpoints
- [Managing API operations](https://gitbook.com/docs/api-references/guides/managing-api-operations.md): Learn how to mark an OpenAPI API operation as experimental, deprecated or hide it from your documentation
- [Configuring the “Test it” button](https://gitbook.com/docs/api-references/guides/configuring-the-test-it-button.md)
- [Using OpenAPI proxy](https://gitbook.com/docs/api-references/guides/using-openapi-proxy.md)
- [Describing enums](https://gitbook.com/docs/api-references/guides/describing-enums.md): Learn how to add descriptions to enums
- [Integrating with CI/CD](https://gitbook.com/docs/api-references/guides/support-for-ci-cd-with-api-blocks.md): Learn how to automate the update of your OpenAPI specification in GitBook
- [Extensions reference](https://gitbook.com/docs/api-references/extensions-reference.md): The complete reference of OpenAPI extensions supported by GitBook


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