Fetch a URL and return structured on-page SEO data: title and meta description with lengths, canonical, robots meta, Open Graph and Twitter cards, headings outline, image alt coverage, word count, lang and hreflang.

Extract every JSON-LD block from a page, list the @type values found, and return the parsed objects along with any parse errors.

Fetch a site's robots.txt and return user-agent groups with their rules, declared sitemaps and crawl-delay directives.

Fetch a sitemap.xml or sitemap index and return the URL count, a sample of entries with lastmod, and any nested sitemaps.

List a page's links split into internal and external with nofollow counts. Optionally HEAD-checks internal links to find broken ones.