Release recency across 10 npm packages used for SEO implementation
A fixed-cohort snapshot of release dates, deprecation notices, runtime requirements, licenses, and maintainer counts for 10 npm packages.
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- Original research or data studyThis article is explicitly classified as a study.
- Linked source dataDownload the dated JSON snapshot
All 10 fixed-cohort npm packages were available on September 13, 2026, and none of their latest versions carried an npm deprecation notice. Nine had published a release since February 2026; robots-parser's latest release dated to February 2023. Release recency and deprecation metadata are maintenance signals, not adoption or quality scores.
This snapshot covers 10 reviewed packages spanning audits, sitemapsA sitemap is a file that lists the pages, images, videos, and other files on your site so search engines can discover them. It helps discovery, but submitting a sitemap doesn't guarantee crawling or indexing., robots parsing, structured dataStructured data is a standardized way of labeling page content (using the schema.org vocabulary in JSON-LD, Microdata, or RDFa) so search engines can understand its meaning. It's not a direct ranking factor — its value is rich results and entity understanding., and framework metadata.
Days since the latest npm release
Nine packages had a release in 2026. robots-parser's latest published version was about 1,300 days old at collection time.
View chart data
| Measure | Age of latest release |
|---|---|
| robots-parser | 1,300 days |
| sitemap | 197 days |
| react-helmet-async | 194 days |
| schema-dts | 174 days |
| lighthouse | 55 days |
| next-seo | 46 days |
| @unhead/schema-org | 23 days |
| astro-seo | 16 days |
| @nuxtjs/robots | 2 days |
| @nuxtjs/sitemap | 1 day |
Release recency as of September 13, 2026. A recent release does not prove quality; an older stable release does not prove abandonment.
Methodology: The collector queried fixed package names from the public npm registry and retained latest-version date, deprecation notice, runtime requirement, license, and maintainer count. Download counts and maintainer identities were excluded. npm public registry.
No latest version carried an npm deprecation notice. That is a registry fact, not a security review or endorsement. The cohort is editorially selected and does not represent every JavaScript SEOMaking sure search engines can crawl, render, and index content that depends on JavaScript. package.
Download the dated JSON snapshot.
Build-time retrieval analysis plus live signals for this exact article. The automatic chunk report includes a deterministic readiness score and is ready without a model download.