Canonical Tag Validator

Validate hreflang implementation (<link rel="alternate" hreflang=...>) to prevent international SEO issues. Detects missing/duplicate hreflangs, invalid language-region codes, missing self reference, and optional reciprocal hreflang checks.

Sitemap Audit

apage/sitemap-audit

Get a Sitemap Health Score (0-100) for any website. Discover, parse, and validate XML sitemaps. Find 404s, redirects, canonical mismatches, noindex conflicts, hreflang issues, missing pages and estimate crawl budget waste.

Crawl a website (or list of pages) and detect broken links (404/500), unreachable URLs, and invalid asset references. Generates a structured report for SEO audits, QA testing, and website maintenance.

Validate Twitter Card meta tags (twitter:card, twitter:title, twitter:description, twitter:image, etc.) to optimize link previews on X (Twitter) and other apps that reuse Twitter card metadata. Detect missing/empty tags, duplicates, invalid URLs, and optionally verify image URL accessibility.

Validate JSON content, check API responses, monitor data quality, and detect schema changes. Perfect for API testing, data validation, quality assurance, and monitoring JSON endpoints. Supports JSONPath, schema validation, and custom rules.

Analyze SEO meta tags for any list of URLs: title tag, meta description, canonical URL, robots meta, Open Graph, Twitter Cards, viewport, and hreflang. Produces a structured report with warnings and an SEO score for audits and QA.

Check and validate Open Graph (og:*) meta tags to improve link previews on Facebook, LinkedIn, Slack, and more. Detect missing/empty OG tags (og:title, og:description, og:image, og:url, og:type), duplicates, invalid URLs, and optional image URL accessibility checks.

Validate Schema.org structured data for SEO. Parses JSON-LD, detects Microdata and RDFa, highlights schema types, and reports common issues like invalid JSON-LD, missing @type, non-schema.org @context, and missing key properties for popular schema types.

Extract and validate structured data from any web page for SEO. Parses JSON-LD, detects Microdata and RDFa, highlights schema.org types, and reports common markup issues.

Audit HTTP caching response headers (Cache-Control, Expires, ETag, Last-Modified, Vary, Age). Optionally tests conditional revalidation using If-None-Match / If-Modified-Since. Useful for web performance tuning and debugging CDN/browser caching behavior.

JSON-LD Schema & Meta Tag Extractor

logiover/json-ld-schema-meta-tag-extractor

Extract JSON-LD/Schema.org structured data, Meta tags, OpenGraph and Twitter Cards from any URL. Get page title + meta description with a clean JSON output for SEO audits, validation, competitor research and AI datasets. Proxy-ready for large crawls.