1. Introduction & Background
When building modern web applications—such as bookmarking tools, content aggregators, or social messaging platforms—providing visual link previews is essential for a great user experience. Seeing a page’s title, description, thumbnail, and favicon instantly gives users context before clicking a link.
However, extracting Open Graph Protocol (OGP) data and HTML metadata manually comes with several developer headaches:
CORS Restrictions: Client-side JavaScript cannot fetch cross-origin HTML directly due to browser security models.
Markup Inconsistencies: Websites embed metadata differently using standard meta tags, Twitter Cards, OGP microdata, or basic fallback HTML.
