curl -sL -A "Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)" \
  "https://store.example.com/products/blue-jacket" -o raw.html

For each page, record whether each element is in the initial HTML or added by JS:

| Content Element | In Initial HTML? | Added by JS? | SEO Impact |
|----------------|:---------------:|:------------:|------------|
| Product name (H1) | ? | ? | Critical |
| Product price | ? | ? | Critical (rich results) |
| Product description | ? | ? | High |
| Product images | ? | ? | High |
| `<title>` | ? | ? | Critical |
| `<meta name="description">` | ? | ? | High |
| `og:title`, `og:image` | ? | ? | Medium |
| JSON-LD structured data | ? | ? | High |
| Canonical URL | ? | ? | Critical |

If the initial HTML contains none of the product-specific content, that is a **P0 crawlability risk**.

---

function injectProductSchema(product) {
  const schema = {
    '@context': 'https://schema.org',
    '@type': 'Product',
    name: product.name,
    image: product.images?.map((i) => i.url),
    description: product.description,
    sku: product.sku,
    brand: product.brand ? { '@type': 'Brand', name: product.brand } : undefined,
    offers: {
      '@type': 'Offer',
      price: product.price.final,
      priceCurrency: product.price.currency,
      availability: product.inStock
        ? 'https://schema.org/InStock'
        : 'https://schema.org/OutOfStock',
      url: window.location.href,
    },
  };
  Object.keys(schema).forEach((k) => schema[k] === undefined && delete schema[k]);

  const el = document.createElement('script');
  el.type = 'application/ld+json';
  el.textContent = JSON.stringify(schema);
  document.head.appendChild(el);
}

curl -sL "https://store.example.com/robots.txt"

async function generateProductSitemap(products, base) {
  const urls = products
    .map((p) => `  <url>\n    <loc>${base}/products/${p.urlKey}</loc>\n` +
      `    <lastmod>${p.updatedAt.slice(0, 10)}</lastmod>\n  </url>`)
    .join('\n');
  return `<?xml version="1.0" encoding="UTF-8"?>\n` +
    `<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n${urls}\n</urlset>`;
}