if theme.structured_data && page.layout === 'post'
  -
    // use json-ld to add structured data

    const title = page.title
    const url = page.permalink
    const imageVal = page.cover_type === 'img' ? page.cover : theme.avatar.img
    const image = imageVal ? full_url_for(imageVal) : ''
    const datePublished = page.date.toISOString()
    const dateModified = (page.updated || page.date).toISOString()
    const author = page.copyright_author || config.author
    const authorHrefVal = page.copyright_author_href || theme.post_copyright.author_href || site.url
    const authorHref = full_url_for(authorHrefVal)

    const jsonLd = {
      "@context": "https://schema.org",
      "@type": "BlogPosting",
      "headline": title,
      "url": url,
      "image": image,
      "datePublished": datePublished,
      "dateModified": dateModified,
      "author": [{
        "@type": "Person",
        "name": author,
        "url": authorHref
      }]
    }

    jsonLdScript = JSON.stringify(jsonLd, null, 2)
  -

  script(type="application/ld+json").
    !{jsonLdScript}