Free Schema Markup Checker & Validator
Also known as a schema tester, structured data checker, or structured data testing tool.
Drop in a URL or paste your code. We’ll show you exactly what structured data your page contains — including syntax errors, missing fields, and which schema types are ready for rich results.
Checks JSON-LD syntax, @context, @type, and required fields for common schema types.
What Is Schema Markup, and Why Should You Care?
Most website owners know about HTML tags like <h1> or <title>, but let’s be honest — they only describe how things look, not what they are. Schema markup, also called structured data, closes that gap. It’s a standardized vocabulary (from schema.org) that labels your content in a way search engines can actually understand.
<h2>Red Apples</h2> — sure, it tells the browser this is a headline. But is it about a fruit? A book? A painting?Product, with a price, an image, and a rating — no guessing required.That extra layer of clarity is what unlocks rich snippets, star ratings, and better visibility in voice search and AI-generated answers — all without changing a single word of visible content. This is exactly why so many SEOs run a schema markup checker or structured data testing tool before and after every major page change.
How to Check Schema Markup on Any Website
Whether you’re auditing your own site or checking if a page has schema markup at all, the process is the same three steps.
Enter a URL or Paste Code
Fetch any live page to check its schema markup, or paste HTML/JSON-LD directly to test before it goes live.
Click Validate
The checker extracts every JSON-LD block on the page and tests its syntax and structure.
Review the Checklist
See detected schema types, missing required fields, and exactly where each block lives in your page.
How to Check If a Page Has Schema Markup at All
Not sure whether a page has any structured data to begin with? Just paste the URL in above — if no JSON-LD is found, the tool tells you plainly instead of returning a confusing empty result. This is often the fastest way to check schema markup on a website you don’t manage yourself, like a competitor’s page you’re benchmarking against.
What This Schema Testing Tool Checks
Being upfront about scope so you know exactly what you’re getting from this schema code checker.
✓ This tool does
- Validates JSON-LD — the format Google recommends and the one 95%+ of sites use today
- Catches JSON syntax errors, with the exact parse error message
- Checks for a valid
@contextpointing to schema.org - Detects every
@type, including@graphstructures - Runs a required-fields checklist for 18+ common types (Article, Product, FAQPage, LocalBusiness, and more)
- Shows whether each block sits in your <head> or <body>
✕ This tool doesn’t
- Check Microdata or RDFa markup — only JSON-LD
- Execute JavaScript — it reads the raw HTML response, so schema injected client-side after page load won’t be seen
- Guarantee rich results — Google still decides whether to actually display them, even with perfectly valid markup
Schema Types With a Full Field Checklist
Any valid @type is detected — these are the ones our structured data checker runs a deeper required-fields audit against.
Common Schema Markup Errors
These are the mistakes a schema markup audit turns up most often — check for them every time you validate structured data.
Invalid JSON syntax
A missing comma, an extra brace, or an unescaped quote will break the entire block — the whole thing gets ignored, not just the broken part.
Missing or incorrect @context
Without “@context”: “https://schema.org”, search engines can’t confirm what vocabulary your markup is even using.
Missing required fields
A Product without offers, or an Article without datePublished, won’t meet the baseline for rich results — even though the JSON itself is technically valid.
Marking up content that isn’t visible
Describing prices, reviews, or FAQs that users can’t actually see on the page violates Google’s structured data guidelines and can get the markup ignored.
Duplicate or conflicting schema blocks
Multiple blocks describing the same entity with different data confuse search engines about which version to trust.
A Few Underused Schema Tips
More data, better output
Schema.org recommends adding as much valid detail as you can — for a recipe, that means cook time, nutrition, author, and video if available.
Only mark up visible content
Don’t describe things users can’t actually see on the page — Google can ignore or penalize markup that misrepresents the content.
Not just for developers
You don’t need to code from scratch — copy JSON-LD from a schema generator or WordPress plugin, then run it through this validator before publishing.
Re-check after every edit
A small template change can silently break your schema. Test schema markup again any time you update a page’s structure or plugin.
Frequently Asked Questions
Is this schema markup checker free to use?
Yes — completely free, no sign-up required, with no limit on how many times you use it.
What’s the difference between a schema checker and a schema validator?
In practice, none — “checker,” “validator,” and “tester” are used interchangeably for tools like this one. They all mean the same thing: confirming your structured data is syntactically correct and complete.
How do I check if a page has schema markup?
Paste the page’s URL into the tool above and run the check. If no JSON-LD is found, it will say so directly instead of returning a confusing empty result.
What types of structured data can it detect?
Any valid JSON-LD @type is detected. We run a deeper required-fields check for 18+ common types, including FAQPage, Product, Organization, and LocalBusiness — see the full list above.
Does it support Microdata or RDFa?
Not currently — this tool focuses on JSON-LD, the format Google recommends and the one used by the vast majority of sites today.
Can I use this to check a competitor’s schema markup?
Yes. Since it just reads publicly available markup, it works the same way on any public URL — useful for benchmarking how competitors structure their product, review, or FAQ data.
Will validating my schema guarantee rich snippets?
No — it helps you meet the baseline requirements, but Google always makes the final call on whether to display a rich result, even for perfectly valid markup.
Do I need a developer to add structured data?
Not necessarily. Schema generators and WordPress plugins can produce the JSON-LD for you — this tool is where you validate it before publishing.
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Validate Before You Publish
One broken JSON-LD block can silently kill your rich results. Check it now — it takes seconds.