XRay

 XRay  is an open source API that returns structured data for a URL by parsing microformats and following other indieweb algorithms, and is part of the p3k suite of applications.

The instance of XRay run by at https://xray.p3k.app is used by webmention.io to parse comment text, and used by Loqi to display a text summary of URLs in the IRC channel.

You can try the API with your own URL or by pasting in HTML in the form at this link:
 * https://xray.p3k.app

IndieWeb Examples

 * using it on gregorlove.com for reply contexts since 2018-01-14
 * using it on gregorlove.com for reply contexts since 2018-01-14
 * using it on gregorlove.com for reply contexts since 2018-01-14