microlinkhq/metascraper: Get unified metadata from websites using Open Graph, Microdata, RDFa, Twitter Cards, JSON-LD, HTML, and more.
https://github.com/microlinkhq/metascraper
Highlight:The metascraper library allows you to easily scrape metadata from an article on the web using Open Graph metadata, regular HTML metadata, and series of fallbacks.
Get unified metadata from websites using Open Graph, Microdata, RDFa, Twitter Cards, JSON-LD, HTML, and more. - microlinkhq/metascraper
The Open Graph Protocol
http://opengraphprotocol.org
"The Open Graph protocol enables any web page to become a rich object in a social graph. For instance, this is used on Facebook to enable any web page to have the same functionality as a Facebook Page."