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🐛JavaScript Analysis: Find Render-Blocking JS Errors

Google can't rank what it can't render, and JavaScript errors are often the hidden reason pages underperform. This audit crawls multiple pages to surface console errors, warnings, and render-blocking issues that most audits miss entirely.

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Who it's for

Developers debugging render issues
SEOs chasing unexplained ranking drops
Teams running JS-heavy frameworks

What you get

Multi-page console error detection across your site
The ability to audit up to 50 websites simultaneously
Render-blocking resource identification and severity categorization
Performance impact assessment and Core Web Vitals impact scoring
Third-party script impact analysis and lazy loading checks
Framework-specific issue detection for React, Vue and Angular
Unused JavaScript detection to trim dead weight

How it works

Enter your website URL
We crawl pages and capture JS errors
Get a prioritized issue report

Sample insight

💡 A third-party script throws console errors on several pages and blocks rendering, delaying when key content becomes visible and dragging down Core Web Vitals.

Frequently asked questions

Why do JavaScript errors hurt SEO?

If JavaScript fails to render, Google may not see your content. This audit surfaces the console errors and render-blocking issues that quietly cost rankings.

Does it work with my framework?

Yes. It includes framework-specific issue detection for React, Vue and Angular, alongside general console and render-blocking checks.

Can I check more than one site?

You can audit up to 50 websites simultaneously, with multi-page console error detection on each.

What does unused JavaScript detection do?

It flags JavaScript that loads but isn't needed, so you can remove dead weight and improve performance and Core Web Vitals.

Related audits

Ready to run the JavaScript Analysis?

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