JSON-LD·Agent Inspector
endeesitzh
structured data · ga4 · agent tools

Inspect the machine-readable web.

Inspect, validate and test structured data, tracking and agent tools on any website. Everything runs locally; nothing is uploaded.

local-only0 trackingWebMCPGA4 dataLayer
Add to Chrome (free)Add to Firefox (free)Add to Safari (free)See it in action☕ Buy me a coffee

Available for Chrome, Firefox and Safari.

// what it does

Everything a technical SEO checks, in one panel

structured data

Structured data

Detect and validate every JSON-LD block (plus Microdata & RDFa), with per-block errors and schema.org links.

on-page seo · headers

On-page SEO & headers

Meta tags, headings, Open Graph & Twitter, images, links and word count, plus HTTP headers and indexability.

social previews · hreflang

Social previews & hreflang

See the Facebook, LinkedIn, X, WhatsApp and Slack card before you share, with a full Open Graph checklist and hreflang validation.

datalayer · ga4 · consent

dataLayer & GA4

Validate GA4 events and Consent Mode v2, get warned about personal data, and cross-check items[] against your JSON-LD. Read-only, with local snapshots.

agent tools · webmcp

Agent tools

Inspect the WebMCP tools a page exposes and test them safely. Destructive tools are gated behind confirmation.

agent readiness

Agent readiness

A transparent, local 0–100 score with llms.txt, robots.txt, sitemap and ai.txt checks.

// screenshots

Screenshots

The real extension UI, rendered in your language.

Structured Data · Inspect JSON-LD in one click
Structured Data: Inspect JSON-LD in one click
Validation · Spot errors and warnings instantly
Validation: Spot errors and warnings instantly
Agent Tools · WebMCP · See a website's agent tools
Agent Tools · WebMCP: See a website's agent tools
Safety first · Test agent tools safely
Safety first: Test agent tools safely
Agent Readiness · Improve your Agent Readiness Score
Agent Readiness: Improve your Agent Readiness Score
On-Page SEO · Audit on-page SEO at a glance
On-Page SEO: Audit on-page SEO at a glance
Social previews · See the card before you share
Social previews: See the card before you share
dataLayer & GA4 · Debug tracking without the console
dataLayer & GA4: Debug tracking without the console
// what's new

New in version 2.4

Free for everyone, and no new permissions: every check stays same-origin and runs on your device.

v2.4

dataLayer, GA4 & Consent Mode v2

  • dataLayer tab: inspect the page's GA4 events, consent signals and GTM containers without opening the console.
  • GA4 event validation: missing required parameters (purchase without transaction_id), non-numeric or zero value, currency that is not ISO 4217, items[] without item_id/item_name, events fired twice, the legacy Universal Analytics structure.
  • Consent Mode v2: missing ad_user_data or ad_personalization, update without or before default, values other than granted/denied.
  • Personal-data warning: e-mails, phone numbers, IBANs and card numbers are reported by path, never by value, and masked in every copy, report and snapshot.
  • Cross-check against the page's JSON-LD: price, currency and SKU mismatches between items[] and your Product markup.
  • Local snapshots: save (masked), filter and diff added, removed, duplicated and changed events, also against the live page.
  • Read-only: dataLayer.push is never wrapped, so nothing about the page changes.
v2.3

Social previews & hreflang

  • Share preview per network: Facebook, LinkedIn, X, WhatsApp and Slack, each with that platform's truncation limits, image ratio and card layout.
  • Complete Open Graph and Twitter checklist. Twitter tags covered by Open Graph count as a fallback instead of being reported missing.
  • Catches the real mistakes: og:url that differs from the canonical, a relative or http:// og:image, name="og:…" instead of property= (Facebook ignores it), unknown twitter:card values.
  • Image check on the measured file, only after you load the preview: below 1200×630, below the 200 px minimum, odd aspect ratio, declared width/height that does not match the file.
  • hreflang validation: BCP-47 syntax, missing self-reference, missing x-default, duplicates and conflicting targets, relative URLs.