product-schema-json-ld

<script type="application/ld+json">
{
 "@context": "http://schema.org/",
 "@type": "Product",
 "name": "Super Hat",
 "image": "http://www.example.com/super-hat.jpg",
 "description": "The best super hat ever from Super Shop.",
 "mpn": "456321",
 "brand": {
   "@type": "Thing",
   "name": "Super Shop"
 },
 "aggregateRating": {
   "@type": "AggregateRating",
   "ratingValue": "4.9",
   "reviewCount": "53"
 },
 "offers": {
   "@type": "Offer",
   "priceCurrency": "GBP",
   "price": "99.99",
   "priceValidUntil": "2018-01-30",
   "itemCondition": "http://schema.org/NewCondition",
   "availability": "http://schema.org/InStock",
   "seller": {
     "@type": "Organization",
     "name": "Super Shop"
   }
 }
}
</script>