StructuredValidator review
A focused free tool for validating, comparing, previewing, and extracting JSON-LD.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
StructuredValidator is a free, browser-based schema markup tool for SEO professionals and developers who need to inspect structured data. It accepts JSON-LD, live URLs, and uploaded HTML, then provides real-time error detection, warnings, recommendations, rich-snippet previews, and schema comparisons. No signup is required, making it suited to quick debugging, review work, and checks during implementation. The web interface and REST API support different workflows, while the schema type library adds examples and implementation guides for common structured-data tasks.
Its strongest area is diagnostic depth within a narrow scope. Users can extract JSON-LD from live URLs, identify differences and missing properties with the comparison tool, and preview how markup may appear as a rich result. Validation history is stored in browser storage and can be exported as JSON or CSV, which helps preserve review records without requiring an account. Optional AI fix suggestions add another way to interpret validation issues, while the open-source model supports inspection and self-hosting for higher-rate production API use.
The Free plan costs 0 and includes JSON-LD validation, URL validation, HTML upload, rich-snippet preview, and no-signup access. Its REST API extracts JSON-LD from URLs without authentication, with a limit of 50 requests per hour per IP address. StructuredValidator is a strong fit when the priority is free validation and debugging across JSON-LD, URLs, and HTML. Teams seeking schema generation, third-party integrations, or a broader workflow platform should choose a more expansive alternative.
StructuredValidator pros and cons
- Where it wins
- Real-time JSON-LD validation with URL and HTML input
- Rich-snippet previews, schema comparisons, and implementation guides
- Free access with no signup and REST API support
- Where it doesn't
- Focused on validation rather than schema generation
- No documented third-party integrations
- API access is limited to 50 requests per hour per IP
StructuredValidator fact sheet, pricing and score →
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