Fixing canonical tag mismatches with www redirects in Next.js for Google indexing

Short summary

A developer launched a new SaaS site and found Google Search Console showing indexing problems caused by canonical tags pointing to the non-www version while the server redirected to www. The fix involved pulling hardcoded domain references into a shared constant and ensuring canonical tags and JSON-LD URLs matched the redirect target. The author notes that TypeScript and test suites won't catch this—only a live view-source will.

• •Canonical tags pointed to non-www while server redirected to www, sending contradicting signals to Google
• •Fix: centralize domain references in a shared constant and align canonical/JSON-LD URLs with redirect target
• •tsc and test suites won't catch this; only a live view-source reveals the mismatch

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