Schema Markup Validator

Validate JSON-LD structured data — check syntax, @type, and required fields, with exact error locations.

100% Browser-Based • Local Processing

Paste your JSON-LD

Paste the JSON on its own, a whole <script type="application/ld+json"> block, or the entire page source — every JSON-LD block found is checked separately. Nothing is uploaded; the parsing happens in this tab. The valid sample is filled in with this site’s own details, so swap in yours before you publish it.

Result

Formatted — ready to paste

Valid is not the same as eligible. This checks that your JSON parses, that it is shaped the way Schema.org and Google’s documentation describe, and that the properties rich results depend on are actually filled in. It cannot tell you whether Google will show a rich result: that also depends on the markup matching visible page content, on your site’s quality, and on policies no client-side tool can see. Run Google’s Rich Results Test before you celebrate — this one is for catching the mistakes first, instantly and without sending your markup anywhere.

Required-field rules come from Google’s structured data documentation, not from Schema.org itself — Schema.org marks almost nothing as mandatory, which is why markup can be “valid” there and still earn no rich result. Types outside the common set are parsed and structurally checked, but their property lists are not, and the report says so rather than implying a clean bill of health.

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Privacy Focused

🔒 Local Processing. Your site data never leaves your device.

Instant Results

🌐 Fully Client-Side. Runs instantly in your browser.

No Signup

⚡ No accounts. No API keys. Just open and use.

Browser Based

🚀 No installs, no crawlers, no site verification.

Overview

What is a Schema Markup Validator?

A Schema Markup Validator checks your JSON-LD structured data for problems. Paste your markup and it parses the JSON, pinpoints any syntax error by location, confirms @context and @type are present, and flags missing required fields for common Schema.org types — so you can fix issues before publishing. It runs locally and complements Google's Rich Results Test.

Structured data only works if it's valid — a single trailing comma or a missing required field can break your JSON-LD and waste the effort. A validator catches those problems before they reach your live site.

This tool parses the JSON-LD you paste, shows exactly where any syntax error is, and checks for the essential Schema.org fields. It runs entirely in your browser, so your markup is never uploaded.

Guide

How to validate schema markup

Step 1: Paste your JSON-LD (or the whole <script type="application/ld+json"> block)

Paste your JSON-LD (or the whole <script type="application/ld+json"> block).

Step 2: Read the result — a syntax error is pinpointed by line/position, or the structure is checked

Read the result — a syntax error is pinpointed by line/position, or the structure is checked.

Step 3: Review flagged issues (missing @type, required fields), fix them, and re-validate

Review flagged issues (missing @type, required fields), fix them, and re-validate.

Details

What it checks — and what it doesn't

The validator does two things. First, it parses your JSON-LD and, if the JSON is malformed, tells you exactly where the error is — the most common problems are trailing commas, unescaped quotes, and mismatched brackets, which are easy to miss by eye. Second, once the JSON parses, it checks the Schema.org structure: that @context and @type are present, and that the required and recommended properties for common types (Article, Product, FAQPage, Organization, Event, and so on) are filled in, warning you about anything missing. It handles multiple blocks and @graph structures. There's one boundary worth being clear about: this validates syntax and structure, not Google's rich-result eligibility — passing here means your markup is well-formed and complete, but whether Google shows a rich result also depends on its content policies and quality judgments. For that final eligibility check, use Google's Rich Results Test or the Schema.org validator, which this tool complements by catching errors instantly and privately first. Everything runs locally in your browser. To create markup, use the JSON-LD, FAQ, HowTo, Breadcrumb, and Article schema generators.

Support

Frequently Asked Questions

What does the schema markup validator check?

It parses your JSON-LD and reports syntax errors with their location, then checks the Schema.org structure — that @context and @type are present and that required and recommended fields for common types are filled in. It catches the malformed-JSON and missing-field problems that stop structured data from working.

How is this different from Google's Rich Results Test?

This validator checks that your JSON-LD is well-formed and structurally complete, instantly and privately in your browser. Google's Rich Results Test additionally checks eligibility for specific Google rich results and reflects Google's current policies. Use this tool to catch errors fast while editing, then confirm eligibility in Google's test before relying on a rich result.

What are the most common JSON-LD errors?

Trailing commas (a comma after the last item in an object or array), unescaped double quotes inside string values, mismatched or missing brackets and braces, and missing @type or required properties. These break parsing or make the markup incomplete. The validator pinpoints the syntax ones by location so they're quick to fix.

Does passing validation guarantee a rich result?

No. Valid, complete markup makes your page eligible for rich results, but Google decides whether to actually show one based on content quality, relevance, and its policies. Validation confirms your structured data is correct; it doesn't force a rich snippet. Treat passing as a necessary step, not a guarantee.

Can it validate multiple schema blocks or @graph?

Yes. It handles markup containing multiple types — whether as separate script blocks or combined in a single @graph array — parsing and checking each. That's useful for real pages that include, say, an Organization, a WebSite, a BreadcrumbList, and an Article together.

Is my structured data private when I validate it?

Yes. Validation happens entirely in your browser — your JSON-LD is never sent to a server, unlike online validators that upload your input. That keeps unpublished markup and any data it contains on your own device, and it works offline once the page has loaded.

Is it free, and do I need to sign up?

Yes, it's completely free with no account, no trial, and no limit on how many times you use it. Unlike most SEO suites, there's no login wall — it runs entirely in your browser, so you just open the page and use it.

Is my data private?

Yes. Everything is processed in your browser — whatever you type or paste is never sent to a server. Nothing is stored once you close the tab, so your URLs, content, and site details stay on your own device. That client-side approach is the core difference from cloud SEO tools.

Does it work on mobile?

Yes. It runs in your phone's browser with nothing to install, so you can generate or check markup on Android or iOS. The layout adapts to small screens, though pasting longer code is easier on a desktop.

Does it work offline?

Once the page has loaded, the work runs entirely on your device, so it keeps working without a connection. You only need to be online to open the page the first time — which is also why nothing you enter is uploaded.

Can I copy the output?

Yes. You can copy the generated code or results to your clipboard with one click, ready to paste straight into your site's HTML, CMS, or files. Because everything runs locally, copying is instant with no upload step.

Will this directly improve my rankings or get me into AI answers?

It produces correct, standards-compliant markup that helps search engines and AI engines (Google, AI Overviews, ChatGPT, Perplexity) understand your page clearly — which is a prerequisite for ranking and being cited. But it doesn't directly change rankings or guarantee a rich result or AI citation; those are decided by the engines based on your overall content and authority.

Still have questions?

If you can't find the answer you're looking for, feel free to contact our support team.

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