Freedom251 › Schema Markup Tools
VitalSentinel Schema Validator
What VitalSentinel Schema Validator is
VitalSentinel Schema Validator checks structured data on a single page URL and separates missing, recommended, and broken information. It inspects JSON-LD blocks individually, including nested entities and entries within an @graph. For broken blocks, it identifies the line and column and points to common syntax causes such as trailing commas, curly quotes, and HTML entities. Property checks distinguish Google-required from recommended fields for Article, Product, FAQPage, Recipe, Event, BreadcrumbList, LocalBusiness, and Organization; other types are listed but not graded. It also flags non-absolute image URLs, dates outside ISO format, and prices containing a currency symbol. The free checker reads server-sent HTML, so it cannot see JSON-LD added by JavaScript. It reports microdata and RDFa when present but does not grade them. Valid markup does not guarantee a Google rich result. The tool offers web and API access; its REST API and MCP server are available on every plan, with monthly credits varying by plan. The free plan costs nothing; paid plans start at $39 a month.
Who it suits
It suits website owners, developers, SEO professionals, and agencies checking structured data on a page. The wider platform also lists Google Analytics 4 and Google Search Console integrations.
What it does well
- Identifies line and column for broken JSON-LD blocks.
- Separates required and recommended properties for eight types.
- REST API and MCP access are available on every plan.
- Free plan requires no credit card.
What to know first
- Free checker checks one URL once.
- JavaScript-added JSON-LD is not visible to the free checker.
- Microdata and RDFa are reported but not graded.
- Valid markup does not guarantee a Google rich result.
Limits
The Free plan includes 500 API credits per month. The free tool checks one URL once, reads server-sent HTML, and is limited to 5 requests per minute, 25 per hour, and 100 per day per IP, plus a per-site limit.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Free plan | Monthly; no credit card required · Up to 1 domain · 3 Synthetic URLs · 1 monitoring location · 25K RUM page views/mo · 100K Web Analytics events/mo · 5 CrUX URLs · 500 API credits/mo | Free |
| Lite | Monthly · Up to 5 domains · 50 Synthetic URLs · 2 monitoring locations · 250K RUM page views/mo · 5M Web Analytics events/mo · 100 CrUX URLs · 25,000 API credits/mo | $129 a month |
| Standard | Monthly · Up to 25 domains · 100 Synthetic URLs · 3 monitoring locations · 2M RUM page views/mo · 25M Web Analytics events/mo · 1,000 CrUX URLs · 100,000 API credits/mo | $249 a month |
| Starter | Monthly · Up to 3 domains · 10 Synthetic URLs · 1 monitoring location · 100K RUM page views/mo · 1M Web Analytics events/mo · 10 CrUX URLs · 2,500 API credits/mo | $39 a month |
| Advanced | Monthly · Up to 50 domains · 250 Synthetic URLs · 5 monitoring locations · 5M RUM page views/mo · 50M Web Analytics events/mo · 5,000 CrUX URLs · 250,000 API credits/mo | $449 a month |
As vitalsentinel.com lists them, read 7 Oct 2026. The maker's own page has the final word.
Getting started
- Open https://www.vitalsentinel.com/tools/schema-validator
- Use the free plan, which requires no credit card
- Enter the page URL for a check
Verdict
VitalSentinel Schema Validator provides detailed JSON-LD checks, including syntax locations and property guidance for eight schema types. Its free checker is limited to one URL and server-sent HTML, and a valid result alone does not ensure a rich result.
Questions
Is VitalSentinel Schema Validator free?
Yes. The Free plan costs nothing, billed monthly, and does not require a credit card. Paid plans start at $39.00 per month.
Which platforms does it support?
The listed platforms are web and API.
What structured data formats does it grade?
It grades JSON-LD property checks for Article, Product, FAQPage, Recipe, Event, BreadcrumbList, LocalBusiness, and Organization. It reports microdata and RDFa when present but does not grade them.
Are API and MCP access included on the Free plan?
Yes. The REST API and MCP server are available on every plan, including Free, with monthly API credits depending on the plan.
Who makes VitalSentinel?
VitalSentinel was founded in 2024 and is headquartered in Bratislava, Slovakia.
What integrations are listed?
VitalSentinel lists Google Analytics 4 and Google Search Console integrations, each with a stated two-minute setup time.
Facts from VitalSentinel Schema Validator's own pages
- API and MCP
- The REST API and MCP server are available on every plan, including Free, with plan-dependent monthly API credits. · vitalsentinel.com, 7 Oct 2026
- Audience
- The maker presents the wider platform for website owners, web developers, SEO professionals, and agencies. · vitalsentinel.com, 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, 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, 7 Oct 2026
- Founded
- 2024 · vitalsentinel.com, 28 Sept 2026
- Google properties
- It distinguishes properties Google requires from those it recommends using Google's tables for each schema type. · vitalsentinel.com, 7 Oct 2026
- Headquarters
- Bratislava, Slovakia · vitalsentinel.com, 28 Sept 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, 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, 7 Oct 2026
- JSON-LD blocks
- It checks each JSON-LD block separately, including nested entities and entities inside an @graph. · vitalsentinel.com, 7 Oct 2026
- Markup formats
- It does not grade microdata or RDFa, though it reports them when present. · vitalsentinel.com, 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, 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, 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, 7 Oct 2026
- Support
- The pricing page says custom solutions for large organizations can include dedicated support and SLAs. · vitalsentinel.com, 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, 7 Oct 2026
- Value checks
- It flags non-absolute image URLs, dates not in ISO format, and prices containing a currency symbol. · vitalsentinel.com, 7 Oct 2026
Where VitalSentinel Schema Validator stands on Freedom251
- Schema Markup Tools#18 of 24