hreflang Map Builder — Builds the complete hreflang annotation set for a multilingual site or a multi-region site from a list of page URLs, answered as JSON only. Every page lists itself and all its alternates, every pair is reciprocal, x-default appears only when a fallback page is named, and codes are checked against ISO 639-1, ISO 3166-1 Alpha 2 and ISO 15924 instead of copied. Reports a bad code, a redirecting, noindexed or non-canonical URL and a page that is not a translation instead of p…

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