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VitalSentinel Schema Validator
Bratislava, Slovakia
What it is
VitalSentinel Schema Validator checks structured data on one page URL and sorts findings into missing, recommended, and broken information. It examines JSON-LD blocks separately, including nested entities and items inside an @graph. For broken blocks, it identifies the line and column and names common causes such as trailing commas, curly quotes, and HTML entities. For Article, Product, FAQPage, Recipe, Event, BreadcrumbList, LocalBusiness, and Organization, its property checks distinguish Google-required fields from recommended ones; other types are listed but not graded. It also flags non-absolute image URLs, dates outside ISO format, and prices containing currency symbols. The free checker reads server-sent HTML, so JSON-LD added by JavaScript is not visible. It reports microdata and RDFa when present but does not grade them. A valid result does not guarantee a Google rich result, and the tool recommends Google's Rich Results Test for rendered pages and eligibility checks. REST API and MCP access are available on every plan with monthly credits that vary by plan. The free tool has request limits; paid plans start at $39 a month.
For and against
For
- Checks JSON-LD blocks individually, including nested entities.
- Identifies line and column for broken blocks.
- Distinguishes required and recommended properties for eight types.
- REST API and MCP are available on every plan.
- Free plan is available.
Against
- Free checker checks one URL once.
- JavaScript-added JSON-LD is not visible.
- Microdata and RDFa are reported but not graded.
- Free usage has per-IP and per-site request limits.
The verdict
The validator gives detailed JSON-LD checks for one URL and flags common value and syntax issues. Its HTML-reading and format limits matter, and valid markup alone does not ensure a Google rich result.
Who it suits
It suits website owners, developers, SEO professionals, and agencies checking JSON-LD markup on a page. The wider VitalSentinel platform also lists Google Analytics 4 and Google Search Console integrations.
Plans and prices
Free plan
Up to 1 domain · 3 Synthetic URLs · 1 monitoring location · 25K RUM page views/mo
Read 7 Oct 2026 · vitalsentinel.com
Starter
Up to 3 domains · 10 Synthetic URLs · 1 monitoring location · 100K RUM page views/mo
Read 7 Oct 2026 · vitalsentinel.com
Lite
Up to 5 domains · 50 Synthetic URLs · 2 monitoring locations · 250K RUM page views/mo
Read 7 Oct 2026 · vitalsentinel.com
Standard
Up to 25 domains · 100 Synthetic URLs · 3 monitoring locations · 2M RUM page views/mo
Read 7 Oct 2026 · vitalsentinel.com
Advanced
Up to 50 domains · 250 Synthetic URLs · 5 monitoring locations · 5M RUM page views/mo
Read 7 Oct 2026 · vitalsentinel.com
On the record
- API and MCP
- The REST API and MCP server are available on every plan, including Free, with plan-dependent monthly API credits.vitalsentinel.com · read 7 Oct 2026
- Audience
- The maker presents the wider platform for website owners, web developers, SEO professionals, and agencies.vitalsentinel.com · read 7 Oct 2026
- Error details
- For a broken block, it identifies the line and column and names common causes such as trailing commas, curly quotes, and HTML entities.vitalsentinel.com · read 7 Oct 2026
- Fair use
- The free tool is limited to 5 requests per minute, 25 per hour, and 100 per day per IP, plus a per-site limit.vitalsentinel.com · read 7 Oct 2026
- Google properties
- It distinguishes properties Google requires from those it recommends using Google's tables for each schema type.vitalsentinel.com · read 7 Oct 2026
- Input limits
- The free tool checks one URL once and reads server-sent HTML, so JSON-LD added by JavaScript is not visible to it.vitalsentinel.com · read 7 Oct 2026
- Integrations
- VitalSentinel lists Google Analytics 4 and Google Search Console as integrations, each with a stated two-minute setup time.vitalsentinel.com · read 7 Oct 2026
- JSON-LD blocks
- It checks each JSON-LD block separately, including nested entities and entities inside an @graph.vitalsentinel.com · read 7 Oct 2026
- Markup formats
- It does not grade microdata or RDFa, though it reports them when present.vitalsentinel.com · read 7 Oct 2026
- Privacy and compliance
- VitalSentinel's privacy policy says it is committed to GDPR and UK GDPR compliance, encrypts Google OAuth tokens, and uses encryption for data in transit and at rest.vitalsentinel.com · read 7 Oct 2026
- Purpose
- The Schema Markup & JSON-LD Validator checks structured data on one page URL and separates missing, recommended, and broken information.vitalsentinel.com · read 7 Oct 2026
- Rich results
- The validator says valid markup does not guarantee a Google rich result and recommends using Google's Rich Results Test as well for rendered pages and eligibility checks.vitalsentinel.com · read 7 Oct 2026
- Support
- The pricing page says custom solutions for large organizations can include dedicated support and SLAs.vitalsentinel.com · read 7 Oct 2026
- Supported types
- Property checks grade Article, Product, FAQPage, Recipe, Event, BreadcrumbList, LocalBusiness, and Organization; other types are listed but not graded.vitalsentinel.com · read 7 Oct 2026
- Value checks
- It flags non-absolute image URLs, dates not in ISO format, and prices containing a currency symbol.vitalsentinel.com · read 7 Oct 2026
