--- title: "No reachable sitemap (seo/sitemap-missing)" description: "seo/sitemap-missing: Sitemaps are the main discovery channel for new and updated URLs, especially for sites with few external links." canonical: https://void-design.vercel.app/rules/seo/sitemap-missing lastModified: 2026-09-16 --- # No reachable sitemap `seo/sitemap-missing` · severity **error** · category SEO · detected by `void seo` and `void audit` ## Why it matters Sitemaps are the main discovery channel for new and updated URLs, especially for sites with few external links. ## How to fix it Add app/sitemap.ts listing every indexable URL with its real lastModified date, and reference it from robots.txt. ## Example ```ts // app/sitemap.ts import type { MetadataRoute } from 'next' export default async function sitemap(): Promise { const posts = await getPosts() return [ { url: 'https://acme.example/', lastModified: '2026-09-01' }, // real content date, NOT new Date() ...posts.map((p) => ({ url: 'https://acme.example/blog/' + p.slug, lastModified: p.updated })), ] } ``` ## References - https://developers.google.com/search/docs/crawling-indexing/sitemaps/build-sitemap - https://nextjs.org/docs/app/api-reference/file-conventions/metadata/sitemap ## More seo rules `void seo` reports 60 rules in this category. What search engines need from the raw response: status codes, titles and descriptions in , self-referencing canonicals, one h1, crawlable links, Open Graph, icons, robots.txt and a sitemap with real dates. - `robots-txt-invalid` robots.txt serves HTML, exceeds 500 KiB, or has unparseable lines — [seo/robots-txt-invalid](https://void-design.vercel.app/rules/seo/robots-txt-invalid) - `robots-blocks-all` robots.txt disallows the site for * / Googlebot / Bingbot — [seo/robots-blocks-all](https://void-design.vercel.app/rules/seo/robots-blocks-all) - `robots-blocks-resources` robots.txt blocks JS/CSS needed to render — [seo/robots-blocks-resources](https://void-design.vercel.app/rules/seo/robots-blocks-resources) - `robots-sitemap-directive` robots.txt has no absolute Sitemap: line — [seo/robots-sitemap-directive](https://void-design.vercel.app/rules/seo/robots-sitemap-directive) - `sitemap-invalid` Sitemap isn't valid sitemap XML or exceeds protocol limits — [seo/sitemap-invalid](https://void-design.vercel.app/rules/seo/sitemap-invalid) - `sitemap-url-invalid` Sitemap is relative or on another host — [seo/sitemap-url-invalid](https://void-design.vercel.app/rules/seo/sitemap-url-invalid) - `sitemap-lastmod` invalid, in the future, or identical across entries — [seo/sitemap-lastmod](https://void-design.vercel.app/rules/seo/sitemap-lastmod) - `sitemap-url-status` Sitemap lists URLs that don't return 200 directly — [seo/sitemap-url-status](https://void-design.vercel.app/rules/seo/sitemap-url-status) Detected by `void seo` and `void audit`. Explain it in a terminal: `void rules seo/sitemap-missing`