JSON-LD is an easy-to-use JSON-based linked data format that defines the concept of context to specify the vocabulary for types and properties. Gmail supports JSON-LD data embedded in HTML documents with the @context of schema.org, as in the following example:
<script type="application/ld+json">
{
"@context": "http://schema.org",
"@type": "Person",
"name": "John Doe",
"jobTitle": "Graduate research assistant",
"affiliation": "University of Dreams",
"additionalName": "Johnny",
"url": "http://www.example.com",
"address": {
"@type": "PostalAddress",
"streetAddress": "1234 Peach Drive",
"addressLocality": "Wonderland",
"addressRegion": "Georgia"
}
}
</script>
The full specifications and requirements for the JSON-LD syntax are available on json-ld.org, and you can also use our Schema Validator tool to try out JSON-LD and debug your markup.