Comparison
General validators check whether your schema is syntactically correct. SchemaCheck checks what Google actually requires for rich results — including current deprecations, property-level restrictions, and eligibility rules. Syntax is the floor, not the goal.
Most schema markup validators confirm that your JSON-LD is well-formed and matches the Schema.org specification. That's genuinely useful — but it answers the wrong question. The question that matters for SEO is not “is this valid JSON-LD?” It's “will Google use this for rich results?”
Google maintains its own set of requirements that differ from the Schema.org spec. It restricts which properties qualify, it deprecates entire schema types (HowTo rich results were deprecated in 2023), and it imposes content policies that a spec validator has no visibility into. SchemaCheck validates against Google's current requirements — not just the spec.
FAQPage restrictions
Google restricted FAQPage rich results to authoritative government and health sites in 2023. A spec validator marks your FAQPage schema as valid. SchemaCheck flags that it won't generate rich results for most sites.
HowTo deprecation
HowTo rich results were deprecated by Google. Schema.org still defines the type as valid. Only a Google-aware validator will warn you that the schema is a dead end.
Required vs recommended properties
Google requires specific properties that the Schema.org spec marks as optional. Missing them produces a syntactically valid schema that Google can't use for rich results.
Schema.org Validator
validator.schema.org
Most comprehensive spec coverage. Validates against the full Schema.org spec. No Google eligibility checks, no API.
Google Rich Results Test
search.google.com/test/rich-results
Google's official renderer. Checks eligibility using Googlebot. Manual, web-only, one URL at a time.
Merkle Schema Markup Validator
technicalseo.com/tools/schema-markup-validator
Popular SEO tool. Web-based, no API, one URL at a time.
SchemaCheck
schemacheck.dev/api/v1/validate
Google eligibility checks, fix suggestions, deprecation warnings, REST API, and monitoring.
| Feature | SchemaCheck | Schema.org | Others |
|---|---|---|---|
Rich result eligibility check SchemaCheck reports whether your schema qualifies for Google rich results. | ✓ | — | — |
Google deprecation warnings Flags HowTo, restricted FAQPage, and other deprecated schema patterns. | ✓ | — | — |
Fix suggestions Each error includes a specific remediation and documentation link. | ✓ | — | — |
Validate by URL All tools support URL-based validation. | ✓ | ✓ | ✓ |
Validate raw JSON-LD Validate schema before publishing — no live page needed. | ✓ | ✓ | Varies |
REST API SchemaCheck is the only option with a machine-readable API. | ✓ | — | — |
Bulk / batch validation Validate entire sitemaps programmatically. | ✓ | — | — |
CI / CD integration Block deploys with schema errors via GitHub Actions. | ✓ | — | — |
URL monitoring Re-validate on a schedule and alert on changes. | ✓ | — | — |
0–100 health score Machine-readable quality score for tracking over time. | ✓ | — | — |
Full Schema.org spec coverage Schema.org validator covers the full spec. SchemaCheck covers Google's supported types. | 35+ types | Full | Varies |
Schema.org validators are spec validators — they reflect what the specification defines, not what Google currently supports. SchemaCheck tracks Google's documented changes to rich result eligibility, including schema types that have been deprecated or restricted for most sites. You get warned before your schema becomes a dead end.
Most validators tell you something is wrong and point at the spec. SchemaCheck tells you exactly which property is missing or malformed, why it matters for rich results, and what the correct value or format should be. Each error links directly to the relevant Google documentation.
Every web-based validator requires a browser, a person, and a single URL at a time. SchemaCheck's REST API lets you validate at scale — in CI pipelines, on a schedule, across thousands of URLs, or from any tool that can make an HTTP request. Free tier covers 100 validations/month.
Web validators are still the right tool for some jobs:
Use both. Web validators for one-off debugging against the spec; SchemaCheck for Google eligibility checks, automation, and monitoring.
Free plan — 100 validations/month. No credit card. Works with any language or platform that can make an HTTP request.