# Missing structured data (JSON-LD) > Answer engines extract facts from schema.org JSON-LD. Without it they guess from prose. Add JSON-LD so AI and Google read your page correctly. _Category: AI readiness · Detector `aeo` · Check `structured-data-missing` · Severity: warning_ Answer engines and rich-result crawlers pull entities, facts, and answers out of `schema.org` `JSON-LD` — an author, a price, a rating, a FAQ. Without it they fall back to guessing from your prose, which is lossy and easy to get wrong. As AI assistants become how people find things, a page with no machine-readable summary is one they’re more likely to skip or misquote. ## Symptoms - No rich results (FAQ, breadcrumb, product, article) in Google - AI assistants summarise the page inaccurately or not at all - Google’s Rich Results Test reports "No items detected" - Competitors with the same content show richer search snippets ## How VibeCheck detects it The `aeo` detector flags this live in the browser and reports it to the widget's Problems list — and to your coding agent over MCP. - **Issue string:** `No structured data (JSON-LD)` - **Threshold:** No ``` ## Framework-specific fixes ### React In React 19 a ` ``` ### Next.js Render the `JSON-LD` as a ` ``` [Vue docs](https://unhead.unjs.io/) ### Svelte Place the `JSON-LD` in ``; SvelteKit renders it server-side so crawlers see it. ```svelte {@html ' ``` ## FAQ ### Which `schema.org` type should I use? Match the page: `Article`/`TechArticle`/`BlogPosting` for content, `Product` for a product, `FAQPage` for Q&A, `Organization`/`WebSite` for the site itself. You can include several types on one page. ### Does `JSON-LD` help with AI answer engines specifically? Yes. Assistants like ChatGPT, Perplexity, and Google’s AI Overviews extract structured facts far more reliably than prose. Clean `JSON-LD` makes your page easier to cite accurately. ### `JSON-LD`, Microdata, or RDFa? Google recommends `JSON-LD` — it’s a single script block separate from your markup, so it’s the easiest to add and maintain, and it’s what VibeCheck checks for. ## Related problems - [Invalid structured data (JSON-LD)](https://vibecheck.wcgw.fun/fix/invalid-structured-data.md) — AI readiness - [Missing author and date signals](https://vibecheck.wcgw.fun/fix/missing-author-metadata.md) — AI readiness - [Missing meta description](https://vibecheck.wcgw.fun/fix/missing-meta-description.md) — Search visibility - [Content only renders with JavaScript](https://vibecheck.wcgw.fun/fix/content-requires-javascript.md) — AI readiness --- Fix guide from VibeCheck — https://vibecheck.wcgw.fun/fix/missing-structured-data. Full site index for LLMs: https://vibecheck.wcgw.fun/llms.txt