Which API can get field information from data sources and workbooks?

The Document API is specifically designed to interact with Tableau files, such as workbooks and data sources, allowing developers to extract detailed information about their structure and contents. When using the Document API, you can programmatically access fields from data sources and workbooks, providing a way to understand the schema, examine metadata, and retrieve elements like calculations, dimensions, and measures.

This capability is essential for developers who may need to automate tasks, perform analyses, or integrate Tableau content with other applications. The Document API is particularly valuable in environments where documentation of data assets and consistency of field definitions across different workbooks and data sources is crucial for governance and usability.

In contrast, other APIs mentioned serve different purposes. The Hyper API is focused on creating and managing Hyper files, which are optimized data storage formats in Tableau. The REST API is used for broader interactions with Tableau Server or Tableau Online, such as user management and publishing tasks, rather than retrieving detailed field information. The Analytics Extensions API is meant for extending Tableau's analytics capabilities by integrating external models and services, but does not provide direct access to metadata from data sources or workbooks.