JSON-LD (JavaScript Object Notation for Linked Data) extends the JSON format to include linking information. The extension has a wide range of uses from knowledge graphs to SEO.

JSON-LD: A JavaScript notation embedded in a script tag in the page head or body. Microdata: An open-community HTML mspecification used to nest structured data within HTML content.

JSON structured data can be inserted in the head as well as the body of your pages, Webmaster Trends Analyst John Mueller explained on the September 11 edition of #AskGoogleWebmasters. The question.

Google Prefers JSON-LD Structured Data Google’s John Mueller made it clear that Google preferred JSON-LD structured data. Personally, I prefer it as well because it’s easier to implement.