Developer releases free Node.js CLI tool to detect hreflang SEO errors

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A developer has published an open-source, zero-dependency Node.js command-line tool called hreflang-audit, designed to identify common international SEO errors in hreflang implementations. The tool crawls websites or parses XML sitemaps and runs 11 checks covering issues such as invalid ISO language codes, missing return links, broken target URLs, and canonical conflicts. Each detected issue is accompanied by a fix hint, and output can be generated as a human-readable report or in JSON format for use in automated pipelines. A GitHub Action is also included, allowing teams to schedule weekly audits and trigger build failures if hreflang regressions are detected. The project is MIT licensed and available on GitHub, with sitemap-versus-HTML mismatch detection planned as a future addition.

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