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Verify Astro Migration SEO — Canonical, Sitemap & Redirect Checks Before Cutover | TestURL.live
Astro Migration Guide

Verify Astro Migration SEO — Before You Lose Rankings

Astro can make a site dramatically faster, but a migration that drops a canonical tag, a redirect, or the sitemap can erase months of rankings in a single cutover. The dangerous part: most SEO regressions are URL-dependent, so they look fine on a *.vercel.app preview and only break under your real domain. Here's exactly what to verify — and how to verify it on your production domain before DNS moves.

Run An SEO Snapshot → The SEO checks
Canonical, sitemap & robots Redirect & trailing-slash trace Checked on your real domain

Why Astro SEO Breaks On The Preview But Not In The Editor

Astro generates the SEO-critical bits — canonical tags, the XML sitemap, RSS, and absolute Open Graph URLs — from the site value in astro.config.mjs, combined with your trailingSlash setting. Those values are only "correct" relative to a hostname. View the same page on my-site.netlify.app and every canonical points at the preview host; the sitemap lists preview URLs; the robots/headers may be a noindex preview policy rather than your production config. Everything looks shipped, but none of it reflects what Googlebot will see once DNS points at the new host. The only honest test is on your real domain.

The Astro SEO Verification Checklist

  1. Canonical tags — every page's <link rel="canonical"> resolves to the correct production URL (right host, right trailing-slash form), not the preview host.
  2. Sitemap — /sitemap-index.xml exists, lists your real-domain URLs, and matches the live URL set. Confirm @astrojs/sitemap picked up site.
  3. robots.txt — present, allows indexing, and references the sitemap. Make sure no preview noindex leaks into production.
  4. Redirects — every changed legacy URL returns a single clean 301 to its new path; no chains, no loops, no 404s.
  5. Trailing slashes — trailingSlash matches the old permalink structure so internal links don't 301-hop.
  6. Meta parity — titles, meta descriptions, and H1s match your pre-migration baseline page-for-page.
  7. Structured data — JSON-LD (Article, Breadcrumb, Organization, FAQ) still validates and references the right URLs.
  8. Open Graph / Twitter — og:url and og:image are absolute and use your real domain.
  9. Status & performance — key pages return 200, and Lighthouse confirms the speed win actually lands on the real domain.

Verify It On Your Real Domain — Before DNS

TestURL.live proxies your domain to the new Astro host (enter a hostname like my-site.netlify.app, my-site.pages.dev, or cname.vercel-dns.com), then runs the SEO-relevant checks against that real-domain preview.

SEO Snapshot

Titles, descriptions, canonical, H1, and meta robots — captured under your real domain, compared to the old site.

Redirect Chain

Trace each hop to confirm legacy URLs land on the new Astro path with one clean 301.

Headers & Indexability

Check X-Robots-Tag, HSTS, CSP, and caching headers so no preview noindex ships to production.

Lighthouse

Confirm Core Web Vitals improved old → new, and that nothing regressed under the production hostname.

Pair this with the Redirect Chain Checker, Security Headers Checker, and HTTP Headers Viewer for a complete pre-cutover audit.

Common Astro SEO Regressions & Their Cause

Symptom Root cause Caught by
Canonicals point at preview hostsite unset / wrongSEO snapshot
Internal links 301-hoptrailingSlash mismatchRedirect chain
Old URLs 404Missing 301 mapRedirect chain
Pages not indexedPreview noindex shippedHeaders audit
Sitemap lists wrong URLs@astrojs/sitemap + siteSEO snapshot
Rich results disappearJSON-LD URLs/host wrongSEO snapshot

Verify Astro Migration SEO — FAQ

How do I verify SEO after an Astro migration?

On your real domain before DNS: confirm canonicals, sitemap, robots, 301s, trailing-slash behavior, meta parity, and structured data. TestURL.live runs an SEO snapshot and redirect trace against a preview that uses your real domain.

Why do canonical tags break after moving to Astro?

They're generated from the site config plus trailingSlash. If site is wrong or unset, canonicals point at the preview host. It only resolves correctly under your real domain.

How do trailing slashes affect Astro SEO?

A mismatch with your old permalinks makes internal links 301-hop and can create duplicate-URL signals. Match the old structure and verify with a redirect-chain check.

Will Googlebot index my Astro preview deploy?

Usually not — preview subdomains are often noindex, and the wrong hostname makes the checks misleading. Verify on your real domain via TestURL.live.

Can I check all this before changing DNS?

Yes. Deploy, add your domain in the host dashboard, then preview through TestURL.live with the platform hostname.

Is the SEO snapshot free?

The preview and Lighthouse comparison are free; the full SEO/visual/security report is on a paid plan or one-time credit.

Related Astro Guides & Tools

Test Astro Before Going LiveThe pre-cutover preview WordPress → Astro ChecklistThe full migration steps Wix/Webflow → AstroLeaving a closed platform Security Headers CheckerHSTS, CSP, X-Robots-Tag

Don't gamble your rankings on a deploy preview.

Free, instant, no signup. Verify your Astro site's SEO on your real domain before you flip DNS.

Verify My Astro SEO →