Support
Or browse existing questions at the issue tracker. Responses are usually within a few business days.
What the extension does
JSON-LD & Agent Inspector inspects, validates and tests structured data and agent tools on any website — for technical SEOs, web developers and agencies. Everything runs locally; nothing is uploaded.
- Detect and validate JSON-LD (plus Microdata & RDFa), with per-block errors and schema.org links.
- On-page SEO: meta tags, headings, Open Graph & Twitter, hreflang, images, links, word count.
- HTTP response headers and indexability for the current page.
- Agent tools (WebMCP) inspection with a safe manual tester and risk classification.
- Agent readiness score with llms.txt / robots.txt / sitemap / ai.txt checks.
Getting started
- Open a page that contains structured data (for example, a product or article page).
- Click the extension’s toolbar icon to open it.
- Browse the tabs: Structured Data, On-Page, Headers, Agent Tools and Readiness.
- Use the report button to produce a print-ready inspection report (saved locally as PDF).
Support the project
The extension is free and privacy-friendly. If it helps your work, you can support ongoing development:
Frequently asked
Does it send my data anywhere? No. See the Privacy Policy — nothing is uploaded and there is no tracking.
Why does a tab sometimes show “allow access”? The extension reads a page only on demand and asks for access per site; it does not run in the background on every page you visit.
Which browsers are supported? Safari, Google Chrome (and Chromium browsers) and Mozilla Firefox.