JSON-LD Validator
Validate JSON-LD structured data online for free. Our validator checks JSON syntax, Schema.org types, required and recommended properties, URL formats, ISO 8601 dates, @graph arrays, and nested structures. Supports pasting with or without <script> tags. Essential for Google rich results and SEO optimization.
Paste your JSON-LD code (with or without <script> tags) or upload a file to check for JSON syntax errors, Schema.org type validation, missing properties, URL issues, and rich results eligibility.
Why Use Our JSON-LD 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 JSON-LD 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 JSON-LD Validator handles any size input — from small configs to massive files with thousands of entries.
100% Free Forever
Use our JSON-LD 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 JSON-LD validator online available.
Common Use Cases for JSON-LD Validator
Google Rich Snippets
Validate your JSON-LD before deploying to ensure Google can parse it correctly and display rich snippets like FAQ dropdowns, star ratings, prices, breadcrumbs, and knowledge panel entries in search results.
Frontend Development
Catch JSON syntax errors, missing commas, unquoted keys, and malformed structures before embedding JSON-LD in your HTML templates. Paste raw JSON or include <script type="application/ld+json"> tags.
Multi-Entity @graph Validation
Validate complex JSON-LD with @graph arrays containing multiple Schema.org entities. Check that each entity has correct @type, required properties, and proper cross-references.
Schema.org Property Checking
Ensure all required and recommended properties are present for each Schema.org type. Get actionable suggestions for missing properties that improve rich result eligibility.
CMS Plugin Debugging
Debug JSON-LD output from WordPress SEO plugins (Yoast, Rank Math), Shopify themes, or custom CMS integrations. Paste the generated output to verify correctness.
API Response Validation
Validate JSON-LD generated by your backend API or SSR framework. Ensure dynamically generated structured data meets Schema.org requirements and contains no serialization errors.
Understanding JSON-LD Validation
What is JSON-LD Validation?
JSON-LD validation is the process of checking JavaScript Object Notation for Linked 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 structured data in web pages using Schema.org vocabulary so search engines like Google, Bing, and Yandex can understand page content and display enhanced search results such as rich snippets, knowledge panels, and carousels. Our free JSON-LD validator online tool checks your content instantly in your browser. Whether you need to validate JSON-LD for Google rich results, SEO optimization, knowledge graph data, social media sharing, e-commerce product markup, article structured data, FAQ pages, breadcrumb navigation, event listings, recipe markup, and web application descriptions, our tool finds errors accurately and privately.
How Our JSON-LD 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 JSON-LD 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 - JSON-LD validator
A JSON-LD validator is a tool that checks JSON-LD files for syntax errors, structural issues, invalid values, and specification compliance. Our JSON-LD validator online tool processes everything in your browser — giving you instant error reports with line numbers and clear descriptions.
Our JSON-LD 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 JSON-LD 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 JSON-LD 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.
Yes! You can paste JSON-LD either as raw JSON or wrapped in <script type="application/ld+json"> tags as it appears in your HTML source. The validator will automatically detect and strip the script tags before validating the JSON content.
JSON-LD (JSON for Linking Data) extends standard JSON with special keywords like @context, @type, @id, and @graph that link your data to Schema.org vocabularies. While it follows JSON syntax rules, these keywords give meaning to your data so search engines can understand what your content is about.
JSON-LD should be placed inside a <script type="application/ld+json"> tag, typically in the <head> section of your HTML. Unlike Microdata, JSON-LD does not need to be embedded within the visible content — it can be placed anywhere in the HTML document.
Google recommends JSON-LD because it separates structured data from HTML markup, making it easier to maintain, update, and debug. JSON-LD does not interfere with your page layout or CSS, can be generated dynamically by JavaScript, and is simpler to implement correctly compared to inline Microdata or RDFa.
This warning means the @type value you used is not in our extensive list of common Schema.org types. Check the spelling and casing (types use PascalCase like "BlogPosting" not "blogPosting"). Visit schema.org/docs/full.html for the complete list of valid types.