URL Validation Tool

The online check validator analyzes a provided URL or HTML snippet for correctness and compliance with common web standards and SEO signals. Primary users include SEO analysts, content editors, web developers, and QA engineers who need automated feedback before publishing. Example: verify a product page URL to confirm title presence, description length, canonical consistency, Open Graph tags, and a valid JSON-LD block.
Core logic covers URL parsing, HTTP/HTTPS status checks, and HTML head parsing to extract title, meta description, canonical link, Open Graph and Twitter Card tags, plus basic heading and accessibility cues. Optional features add structured data validation (JSON-LD and microdata), schema-specific checks, SEO scoring, and exportable reports. Validation rules are configurable by profile (SEO, Accessibility, Schema) and support timeouts, redirects, and following or not following redirects. Outputs are machine-friendly summaries plus per-field details, including status codes, flag booleans, and a composite score. The tool emphasizes determinism and reproducibility for audit trails and PR reviews. In practice, teams use it during pre-publish checks for blogs, product pages, and landing pages to catch issues early and improve search visibility.