A JSON containing all structure data that the respective website page uses. If the website page could not be read or there is not any structured data inside the HTML content, then returns null.

typeStringType of structure data technology that the website is using on the referring page.
keyStringKey related to the type of technology function used on website page content. For example, some are related to images, other for description, others for URL and so on...
valueStringValue implemented on the respective structured data on website content page.