Render diff

render_diff

Compares raw HTML with the page rendered in headless Chromium and reports which SEO signals depend on JavaScript.

What it does

Fetches one URL twice, as raw HTML and rendered in headless Chromium, and compares SEO signals: title, meta robots, canonical, hreflang, headings, main text, links, structured data and images. Use when asked whether content or links depend on JavaScript, whether search engines or AI crawlers that do not render see the page, or why JavaScript changes indexing signals. Returns pass/warn/fail with findings, both snapshots and a diff. Takes 8 to 30 seconds.

~18 s · up to 12 requests · v1.0.0

Call it from code

REST endpoint (POST)

https://tech-seo.de/api/v1/checks/render_diff

MCP tool name

render_diff

cURL

curl -X POST https://tech-seo.de/api/v1/checks/render_diff \
  -H 'content-type: application/json' \
  -d '{"url":"https://example.com/"}'

Parameters and result format →