Structured Data Validator
Validate JSON-LD structured data online for free. Our validator checks Schema.org types, required and recommended properties, URL formats, ISO 8601 dates, @graph arrays, and nested object structures with detailed error messages. Essential for Google rich results, SEO optimization, and search engine visibility.
Paste your JSON-LD structured data or upload a file to check for Schema.org type errors, missing required properties, invalid URLs, date format issues, and Google rich result eligibility.
Why Use Our Structured Data Validator?
Instant Validation
Our tool to validate JSON-LD analyzes your content instantly in your browser. Validate JSON-LD files of any size with zero wait time — get detailed error reports with line numbers in milliseconds.
Secure & Private Processing
Your data never leaves your browser when you use our structured data validator online tool. Everything is processed locally using JavaScript, ensuring complete privacy and security for sensitive configuration data.
No File Size Limits
Validate large JSON-LD files without restrictions. Our free Structured Data Validator handles any size input — from small configs to massive files with thousands of entries.
100% Free Forever
Use our Structured Data Validator completely free with no limitations. No signup required, no hidden fees, no premium tiers, no ads — just unlimited, free validation whenever you need it. The best free structured data validator online available.
Common Use Cases for Structured Data Validator
Google Rich Results Eligibility
Validate your JSON-LD markup to ensure it meets Google's requirements for rich results like FAQ snippets, product cards, recipe carousels, how-to guides, breadcrumbs, and review stars in search results.
SEO and Schema.org Compliance
Check your structured data against Schema.org types and properties. Ensure @context, @type, and all required properties are present and correctly formatted for maximum search engine understanding.
Web Development and CMS Integration
Validate JSON-LD snippets before adding them to your website, CMS templates, or server-side code. Catch JSON syntax errors, missing properties, and type mismatches early in development.
E-Commerce Product Markup
Validate Product, Offer, AggregateRating, and Review markup for e-commerce pages. Ensure correct pricing formats, availability values, rating ranges, and brand information for shopping rich results.
Content Publisher Markup
Validate Article, NewsArticle, BlogPosting, and related types. Check for required author, datePublished, headline, and publisher properties that Google expects for article rich results.
CI/CD and Automated Testing
Integrate structured data validation into your build pipeline. Catch markup errors before deployment to prevent loss of rich results and search visibility in production.
Understanding JSON-LD Validation
What is JSON-LD Validation?
JSON-LD validation is the process of checking JSON for Linking Data files (.json) for syntax errors, structural issues, invalid values, duplicate keys, and specification compliance — helping you catch problems before deployment. JSON-LD is widely used for embedding machine-readable Schema.org structured data in web pages to help search engines like Google, Bing, and Yahoo understand page content and display enhanced rich results in search listings. Our free structured data validator online tool checks your content instantly in your browser. Whether you need to validate JSON-LD for Google rich results, SEO enhancement, search engine optimization, knowledge graph data, product listings, article markup, FAQ pages, breadcrumb navigation, event listings, recipe markup, and social media sharing, our tool finds errors accurately and privately.
How Our structured data validator Works
- Input Your JSON-LD Content: Paste your JSON-LD content directly into the text area or upload a
.jsonfile from your device. Our structured data validator online tool accepts any JSON-LD input. - Instant Browser-Based Validation: Click the "Validate JSON-LD" button. Our tool analyzes your content entirely in your browser — no data is sent to any server, ensuring complete privacy.
- Review Detailed Error Reports: View a comprehensive list of errors with line numbers, descriptions, and severity levels. Fix issues with pinpoint accuracy using our clear error messages.
What Gets Validated
- Syntax Correctness: Checks for proper syntax including balanced brackets, correct string quoting, valid escape sequences, and proper key-value pair formatting.
- Data Types: Validates integers, floats, booleans, strings, datetimes, arrays, and inline tables conform to the JSON-LD specification.
- Structural Integrity: Detects duplicate keys, conflicting table definitions, invalid table headers, and malformed sections.
- Line-by-Line Reporting: Every error includes its exact line number and a clear description, making it easy to find and fix issues in your JSON-LD files.
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Frequently Asked Questions - structured data validator
A structured data validator is a tool that checks JSON-LD files for syntax errors, structural issues, invalid values, and specification compliance. Our structured data validator online tool processes everything in your browser — giving you instant error reports with line numbers and clear descriptions.
Our structured data validator detects syntax errors (missing brackets, incorrect quoting), structural issues (duplicate keys, conflicting table definitions), invalid data types (malformed numbers, dates, strings), invalid escape sequences, and specification violations. Each error includes its exact line number for easy debugging.
Absolutely! Your data is completely secure. All validation happens directly in your browser using JavaScript — no data is ever uploaded to any server. Your configuration files, secrets, and sensitive data never leave your device.
Yes, our structured data validator is 100% free with absolutely no hidden costs or limitations. There's no signup required, no premium tier, no usage limits, no file size restrictions, and no advertisements. Use it unlimited times for any project.
Yes! Our structured data validator online tool handles files of any size. Since all processing happens in your browser, performance depends on your device, but modern browsers handle even very large JSON-LD files efficiently.
Our validator supports over 150 Schema.org types including Article, Product, Organization, LocalBusiness, FAQPage, BreadcrumbList, HowTo, Recipe, Event, Review, VideoObject, WebApplication, Course, JobPosting, and many more. It checks required and recommended properties for each type.
Yes! The validator checks for properties that Google requires for rich results. It verifies required fields like headline and author for Articles, mainEntity for FAQPage, itemListElement for BreadcrumbList, and offers for Products. Missing required properties are flagged as errors.
Absolutely. The validator fully supports @graph arrays which allow you to include multiple Schema.org entities in a single JSON-LD block. Each entity within the @graph is individually validated for type correctness, required properties, and proper formatting.
Our validator performs instant client-side validation of JSON-LD syntax and Schema.org compliance. Google's Rich Results Test checks your live page by URL and shows how Google actually interprets your data. Both are complementary: use our tool for quick development validation and Google's tool for final production verification.
Yes! You can paste JSON-LD either as raw JSON or wrapped in <script type="application/ld+json"> tags. The validator will automatically strip the script tags and validate the JSON content inside.