Sitemap Validator

About Sitemap Validator

This sitemap validator parses XML sitemap files and reports on structure, URL count, duplicate detection, and format compliance. It supports both standard sitemaps (urlset) and sitemap indexes (sitemapindex), helping SEO specialists and developers verify sitemap correctness before submission to search engines.

The validator uses browser-based XML parsing (DOMParser) to analyze sitemap structure without sending data to any server. All processing happens locally in your browser.

Sitemap XML Structure Overview

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url>
    <loc>https://example.com/page1</loc>
    <lastmod>2026-01-15</lastmod>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://example.com/page2</loc>
    <lastmod>2026-01-10</lastmod>
  </url>
</urlset>

Elements:
  <loc>     - Required. Absolute URL (including protocol)
  <lastmod> - Optional. Last modification date (ISO 8601)
  <changefreq> - Optional. always/hourly/daily/weekly/monthly/yearly/never
  <priority> - Optional. 0.0 to 1.0 (default 0.5)

Sitemap Index Format

For sites with more than 50,000 URLs or files larger than 50MB (uncompressed), use a sitemap index:

<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <sitemap>
    <loc>https://example.com/sitemap1.xml</loc>
    <lastmod>2026-01-15</lastmod>
  </sitemap>
  <sitemap>
    <loc>https://example.com/sitemap2.xml</loc>
    <lastmod>2026-01-14</lastmod>
  </sitemap>
</sitemapindex>

JavaScript Validation Algorithm

// Sitemap Validator Implementation

function validateSitemap(xmlString) {
  // Parse XML using DOMParser
  const parser = new DOMParser();
  const doc = parser.parseFromString(xmlString, "text/xml");

  // Check for parse errors
  const parseError = doc.querySelector("parsererror");
  if (parseError) {
    return { valid: false, error: "Invalid XML: " + parseError.textContent };
  }

  const root = doc.documentElement;
  const report = [];

  // Check root element
  report.push("Root element: " + root.nodeName);

  if (root.nodeName === "urlset") {
    // Standard sitemap
    const urls = Array.from(doc.getElementsByTagName("url"));
    const locs = urls.map(url => {
      const loc = url.getElementsByTagName("loc")[0];
      return loc ? loc.textContent.trim() : "";
    }).filter(Boolean);

    // Detect duplicates
    const duplicates = locs.filter(
      (loc, index) => locs.indexOf(loc) !== index
    );

    report.push("URL count: " + locs.length);
    report.push("Duplicate URLs: " + duplicates.length);
    report.push("Sample URLs: " + locs.slice(0, 5).join(", "));

  } else if (root.nodeName === "sitemapindex") {
    // Sitemap index
    const sitemaps = Array.from(doc.getElementsByTagName("sitemap"));
    report.push("Nested sitemap count: " + sitemaps.length);
  }

  return { valid: true, report: report };
}

Sitemap Requirements and Limits

Common Sitemap Errors

Sitemap Best Practices

• Include only canonical URLs: Exclude redirects, 404s, noindex pages, and duplicate content
• Use absolute URLs: Always include full URL with protocol (https://example.com/page)
• Keep sitemaps updated: Update when content changes; accurate lastmod dates help crawl prioritization
• Split large sitemaps: Use sitemapindex when approaching 50,000 URLs or 50MB limit
• Reference in robots.txt: Add "Sitemap: https://example.com/sitemap.xml" to robots.txt
• Submit to Search Console: Submit via Google Search Console and Bing Webmaster Tools
• Use gzip compression: Compress sitemaps to .xml.gz for faster download (limit still 50MB uncompressed)
• Validate before submission: Check XML validity and structure before submitting to search engines

How to Submit Sitemap to Search Engines

1. Google Search Console:
   • Verify site ownership in Search Console
   • Navigate to "Sitemaps" in left menu
   • Enter sitemap URL (e.g., sitemap.xml)
   • Click "Submit"
   • Monitor coverage and errors in report
2. Bing Webmaster Tools:
   • Verify site in Bing Webmaster Tools
   • Go to "Sitemaps" section
   • Submit sitemap URL
   • Review crawl statistics
3. robots.txt reference:
   • Add line: Sitemap: https://example.com/sitemap.xml
   • Place at top or bottom of robots.txt
   • Search engines discover sitemap automatically

Sitemap Priority and Change Frequency Reference

Sitemap Example for Different Site Types

E-commerce Site Sitemap Structure:

sitemap.xml (index file)
├── sitemap-products.xml (product pages)
├── sitemap-categories.xml (category pages)
├── sitemap-brands.xml (brand pages)
├── sitemap-blog.xml (blog posts)
└── sitemap-static.xml (about, contact, etc.)

Each sub-sitemap contains up to 50,000 URLs.
Index file references all sub-sitemaps.
Submit only the index file to Search Console.