Simple StructuredData Viewer

Simple StructuredData Viewer lets you inspect the JSON-LD structured data embedded in any webpage — instantly, without leaving the browser.

Click the extension icon and see all JSON-LD blocks on the current page, parsed and displayed in a clean, collapsible tree view. The data is automatically grouped into tabs by schema type (e.g. LocalBusiness, Product, WebPage, FAQPage) and sorted by relevance, so the most important information is always at the top.

What it does:

• Extracts and parses all JSON-LD structured data from the current page
• Displays the data in an interactive, collapsible tree view with syntax highlighting
• Groups multiple schema blocks into separate tabs by @type
• Sorts tabs by SEO relevance (e.g. Organization and Product before BreadcrumbList)
• Flattens @graph arrays so each type gets its own tab
• Detects and highlights URLs as clickable links
• Shows parse errors with the raw source for easy debugging

Validation tools built in: The sidebar provides quick access to external validation tools. Click a checker icon to open it in a new tab with the current page URL pre-filled — or right-click to open it in a background tab. Default checkers include Google Rich Results Test, Schema.org Validator, and JSON-LD Playground. You can add, edit, remove, and reorder checkers in the settings. Checker URLs support two placeholders: {URL} for the page address and {JSONLD} for passing the extracted JSON-LD data directly.

Flexible display options:

• Open as a popup attached to the toolbar, or in a full browser tab for more space
• Light, dark, and auto theme (follows your system setting)
• Adjustable font size (10–18 px)

No data leaves your browser. The extension works entirely locally. It reads the page's existing JSON-LD markup, parses it in the browser, and displays it. No external servers, no tracking, no analytics.

Built for web developers, SEO specialists, and webmasters who work with structured data on a daily basis.

Tags / Keywords json-ld, structured data, schema.org, seo, rich results, developer tools, json viewer, structured data testing, schema markup, webmaster tools