実践的なSEOのためのJSON-LDスキーママークアップガイド

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Article",
  "@id": "https://example.com/en/json-ld-schema-guide/#article",
  "headline": "JSON-LD Schema Markup Guide for Practical SEO",
  "description": "A practical guide to choosing, generating, and validating structured data.",
  "image": "https://example.com/images/json-ld-guide.png",
  "datePublished": "2026-03-28T10:00:00+00:00",
  "dateModified": "2026-05-31T10:00:00+00:00",
  "author": {
    "@type": "Organization",
    "name": "Example Publisher"
  },
  "publisher": {
    "@type": "Organization",
    "name": "Example Publisher",
    "logo": {
      "@type": "ImageObject",
      "url": "https://example.com/logo.png"
    }
  },
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://example.com/en/json-ld-schema-guide/"
  }
}
</script>

private MarkupString BuildJsonLd(PageMetaData meta)
{
    var pageUrl = BuildPageUrl(meta);

    var schema = new Dictionary<string, object?>
    {
        ["@context"] = "https://schema.org",
        ["@type"] = "Article",
        ["@id"] = $"{pageUrl}#article",
        ["headline"] = meta.Title,
        ["description"] = meta.Description,
        ["url"] = pageUrl,
        ["datePublished"] = meta.Published?.ToString("O"),
        ["dateModified"] = meta.Modified?.ToString("O"),
        ["inLanguage"] = CS.Culture
    };

    var json = JsonSerializer.Serialize(schema, new JsonSerializerOptions
    {
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
    });

    return new MarkupString($"<script type=\"application/ld+json\">{json}</script>");
}