Category pages - example code

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "WebPage",
  "breadcrumb": "Books > Literature & Fiction > Classics",
  "mainEntity":{
          "@type": "Book",
          "author": "/author/jd_salinger.html",
          "bookFormat": "https://schema.org/Paperback",
          "datePublished": "1991-05-01",
          "image": "catcher-in-the-rye-book-cover.jpg",
          "inLanguage": "English",
          "isbn": "0316769487",
          "name": "The Catcher in the Rye",
          "numberOfPages": "224",
          "offers": {
            "@type": "Offer",
            "availability": "https://schema.org/InStock",
            "price": "6.99",
            "priceCurrency": "USD"
          },
          "publisher": "Little, Brown, and Company",
          "aggregateRating": {
            "@type": "AggregateRating",
            "ratingValue": "4",
            "reviewCount": "3077"
          },
          "review": [
            {
              "@type": "Review",
              "author": "John Doe",
              "datePublished": "2006-05-04",
              "name": "A masterpiece of literature",
              "reviewBody": "I really enjoyed this book. It captures the essential challenge people face as they try make sense of their lives and grow to adulthood.",
              "reviewRating": {
            "@type": "Rating",
            "ratingValue": "5"
           }
            },
            {
              "@type": "Review",
              "author": "Bob Smith",
              "datePublished": "2006-06-15",
              "name": "A good read.",
              "reviewBody": "Catcher in the Rye is a fun book. It's a good book to read.",
              "reviewRating": "4"
            }
          ]
        }
}
</script>