Validate JSON-LD Markup
Check JSON-LD code for syntax errors and potential structured data issues.
SEO TOOL / STRUCTURED DATA
Free Schema Markup Validator
Validate your website's structured data and identify potential errors in your schema markup. Check JSON-LD, Microdata, and RDFa to ensure your structured data follows the Schema.org vocabulary.
Paste your schema code or enter a webpage URL to inspect structured data. Find syntax errors, review detected schema types, and identify properties that may need attention.
✓ Free online tool. No registration required.
Test Your Structured Data
ADD MARKUP OR A PAGE URL · REVIEW DETECTED SCHEMA · CHECK VALIDATION RESULTS
Paste JSON-LD, paste HTML, or enter a page URL to validate its structured data.
Schema.org validity and Google rich result eligibility are checked separately: markup can be valid Schema.org and still not qualify for a rich result. Property names are checked against a built-in list of common types, so an unfamiliar-but-real property may be flagged — treat those as prompts to double-check, not as errors.
SCHEMA VALIDATOR WORKSPACEMOSANKIT / SEO & WEBSITE TOOLS
STRUCTURED DATA BASICS
What Is Schema Markup Validation?
Schema markup validation is the process of checking structured data on a webpage to identify syntax errors, incorrect properties, and potential implementation issues.
Structured data uses formats such as JSON-LD, Microdata, and RDFa to describe webpage content in a machine-readable format.
Validation helps developers and SEO specialists identify problems before publishing or updating structured data. It can also help determine whether markup follows Schema.org vocabulary and whether it meets the requirements of supported search enhancements.
Valid structured data does not guarantee rich results or improved search rankings.
VALIDATION FEATURES
Key Features of MoSanKit Schema Validator
Support Multiple Formats
Inspect JSON-LD, Microdata, and RDFa structured data.
Detect Schema Types
Identify common structured data types used across websites.
Find Missing Properties
Highlight missing required properties and useful recommendations for supported rich result types.
Identify Syntax Errors
Find malformed JSON and other detectable markup issues.
Clear Validation Results
Review detailed results and make corrections before validating your code again.
WHAT THE TOOL CHECKS
Review Your Structured Data
HOW IT WORKS
How to Validate Schema Markup
01 / OPEN
Open the Validator
Go to the MoSanKit Schema Validator.
02 / CHOOSE
Choose an Input Option
Select JSON-LD code, HTML source code, or a webpage URL.
03 / ADD
Paste Your Markup
Paste your code or enter the publicly accessible webpage URL.
04 / VALIDATE
Validate Schema Markup
Start the validation to inspect the supplied structured data.
05 / REVIEW
Review Validation Results
Check detected schema types, syntax errors, property issues, and missing required fields.
06 / CORRECT
Update and Validate Again
Correct the markup on your website and run the validation again to review the updated structured data.
UNDERSTAND THE RESULTS
Schema Validity and Rich Result Eligibility
A schema validator checks structured data syntax and Schema.org vocabulary. Google's Rich Results Test checks whether supported structured data meets Google's requirements for rich result eligibility.
A schema can be valid according to Schema.org without qualifying for a Google rich result. Valid markup does not guarantee that Google will display rich results, and schema validation does not directly improve search rankings.
WHO IT'S FOR
Who Can Use This Tool?
SEO SpecialistsReview structured data during technical SEO audits.
Web DevelopersFind schema implementation errors before publishing.
Website OwnersCheck whether structured data is correctly configured.
Digital Marketing AgenciesValidate schema markup across client websites.
Content PublishersInspect article and webpage structured data.
GOOD TO KNOW
A few things, answered.
Quick answers about schema validation and structured data.
A schema validator is a tool that checks structured data markup for syntax errors, invalid properties, and other potential issues.
Yes. You can validate structured data online for free without creating an account.
The tool is designed to support JSON-LD, Microdata, and RDFa structured data.
A schema validator checks structured data syntax and vocabulary. Google's Rich Results Test checks whether supported structured data meets Google's requirements for rich result eligibility.
No. Valid markup does not guarantee that Google will display rich results. Search engines consider several factors when deciding which enhanced search features to show.
Common issues include invalid JSON syntax, incorrect property names, missing required properties, incorrect data types, and malformed URLs.
Yes. You can paste your JSON-LD code or HTML source directly into the validator without entering a webpage URL.
It means a property required for a particular supported structured data feature is missing. Adding the property may be necessary for eligibility, depending on the schema type and search engine requirements.
Yes. A webpage can contain multiple structured data entities. The validator should inspect each detected entity and report its results separately.
Validation does not directly improve rankings. It helps identify structured data issues so you can maintain accurate and properly implemented markup.
KEEP OPTIMIZING
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Find and Fix Your
Schema Markup Issues.
Validate your structured data, identify potential errors, and keep your website's schema markup organized with MoSanKit.