# What do Google and AI agents read on your product page?

> Free test: paste a product page and see the structured data Google and AI shopping agents read (price, stock, brand, GTIN, variants). On Shopify, we compare it with your live price and stock.

Free structured data tester by catalogaudit: https://catalogaudit.app/structured-data-tester (no signup, nothing stored beyond a salted IP hash used for daily limits).

## What it checks

- Reads the page's Product and ProductGroup JSON-LD the way Google and AI crawlers do
- Shows price, currency, availability, brand, GTIN, variants and attributes as published
- Compares the page with Shopify's live price and stock (Ajax API) for each variant
- Runs the audit's structured-data rules and explains how to fix each finding
- Spots structured data added by JavaScript, which most AI crawlers never see

## Questions

### What is product structured data?

A block of JSON-LD in the page that describes the product in schema.org's vocabulary: name, brand, GTIN, price, currency, availability, variants. Google Merchant Center and AI shopping agents read it instead of guessing from your page design. Most Shopify themes publish a basic version; apps and theme edits often break it.

### Why must the price in structured data match my store?

Google compares the price and availability your page publishes with your Merchant Center feed and the landing page. A mismatch gets items disapproved ("Mismatched value"), and an AI agent that quotes a stale price or recommends a sold-out product stops trusting the listing.

### The tester says there's no structured data, but my theme adds it. Why?

If an app or theme builds the JSON-LD with JavaScript after the page loads, it isn't in the HTML a crawler downloads. Google renders JavaScript eventually; most AI crawlers don't. We flag that case separately so you know the data exists but is invisible to them.

## Next

- Run the free full audit, which includes these checks and more: https://catalogaudit.app/#audit
- More free tools: https://catalogaudit.app/tools
- Talk to us: hello@catalogaudit.app