JavaScript SEO Checker: See What Google Sees
Compare the HTML your server sends with the DOM produced after JavaScript runs. Find rendering gaps before they affect search indexing and AI crawler visibility.
Public URLs only. Most checks finish in 20–30 seconds.
How It Works
Three steps to uncover what search engines actually see
1. Fetch Raw HTML
We request your page and capture the initial HTML response — exactly what a crawler sees first.
2. Render with JavaScript
We run your JavaScript in a real browser environment and wait for the DOM to settle.
3. Compare & Report
We diff the raw and rendered versions, flagging critical SEO elements that changed or disappeared.
What the JavaScript SEO Checker detects
WatchThis checks whether important SEO elements are present in the initial HTML response or appear only after JavaScript executes. The report highlights differences that may affect crawling, indexing, link discovery and machine-readable metadata.
Title & Meta Tags
Verify title, description, canonical, and robots meta are present in raw HTML
Missing Content
Detect headings, links, and text that only appear after JavaScript runs
Structured Data
Check if JSON-LD schema is in raw HTML or added client-side
JavaScript Errors
Surface runtime errors that might prevent rendering
Redirect Chains
Track HTTP redirects and identify unnecessary hops
Internal Links
Compare link counts before and after rendering
See It In Action
Clear, actionable insights with severity levels
WatchThis uses a real Chromium browser to compare initial HTML with the rendered DOM. It is a diagnostic tool, not an exact replica of Google Search infrastructure.