Free Schema Markup Validator & JSON-LD Editor
Write or paste your JSON-LD and validate it in real time against Google's Rich Results specification. Catch missing properties and syntax errors before they cost you a rich result. No sign-up, no install.
{ "@context": "https://schema.org", "@type": "WebSite", "name": "My Website", "url": "https://example.com" }
Free tool vs Plugin
| Feature | Web Tool | Schemafy Plugin |
|---|---|---|
| Generates valid JSON-LD | ✓ | ✓ |
| Manual copy & paste | ✓ | — |
| Automatic injection in WordPress | — | ✓ |
| Sync with posts/pages | — | ✓ |
| AI Generator by URL | — | ✓ |
| Bulk schema management | — | ✓ |
| Meta Tags & Open Graph | — | ✓ |
| Dynamic variables | — | ✓ |
| Priority support | — | ✓ |
Most validators give you a pass/fail and stop there. This one is an editor too, so you fix the markup in the same window you test it. It is built by the team behind a WordPress schema plugin, which means the next step, getting validated markup onto live pages, is covered below instead of left to you.
How to validate your JSON-LD schema
The tool runs three actions on whatever you paste or type.
- 1
Paste or write your JSON-LD. Drop in code from any source, or start from the sample and edit it.
- 2
Read the real-time validation. The editor checks your markup against Google's structured data rules as you type and flags what is wrong and where.
- 3
Format, minify, and copy. Clean up the indentation, strip whitespace for production, and copy valid code in one click.
What is a schema markup validator?
A schema markup validator is a tool that checks whether your structured data is written correctly and whether search engines can read it. It confirms two things: that the JSON-LD is valid syntax, and that it follows the rules for the schema type you are using, such as Product, Article, or FAQPage.
That is different from a generator. A generator writes the code for you. A validator checks code you already have. This tool does both, which is why you can fix an error and re-check it without leaving the page. If you would rather build from scratch with a visual form, use the schema markup generator instead, then bring the output here to validate.
What this validator checks, and what it does not
Honesty matters here, because a green checkmark can be misread.
This editor checks your JSON-LD for valid syntax and for the required and recommended properties of each schema type. It does not crawl your live page, and it cannot promise Google will show a rich result. No validator can. Eligibility and display are Google's call, based on content quality and policy, not markup alone.
For the official second opinion, run the same code through Google's Rich Results Test and the Schema.org validator. Use all three together: this editor to write and fix fast, Google's test for eligibility, Schema.org for spec conformance.
Common JSON-LD errors this editor catches
Most broken schema fails for the same handful of reasons. These are the ones worth knowing before you publish.
Missing required properties. A Product without name or offers, an Organization without name, an Event without startDate. Google ignores the markup when a required field is absent.
Wrong @type or @context. A typo in @type, or @context pointing somewhere other than https://schema.org, makes the whole block unreadable.
Invalid values. priceCurrency that is not a valid ISO code, an availability value Google does not recognize, a malformed date in startDate.
Syntax errors. Trailing commas, unescaped quotes inside strings, and mismatched braces. These break the JSON before Google even reads the schema.
Markup that does not match the page. Google requires structured data to describe content visible on the page. Marking up a review or price that is not on the page is a policy violation, not just a warning.
Valid JSON-LD vs. rich result eligibility
This is the distinction that trips up most people, so it gets its own section.
Valid markup means your code is correct. Eligible means Google could show a rich result for it. Displayed means Google actually does. They are three separate gates, and passing the first does not carry you through the other two.
| Stage | What it means | Who controls it |
|---|---|---|
| Valid | Syntax and required properties are correct | You. This editor checks it. |
| Eligible | The page qualifies for a rich result type | Google's documented requirements |
| Displayed | Google chooses to show the rich result | Google, at query time |
A clean validation is necessary, not sufficient. It removes the technical reason a rich result fails. Content quality, page policy, and Google's own judgment handle the rest.
How to add validated JSON-LD to WordPress
Validated code still has to reach a live page. On WordPress you have three routes.
The manual route
Paste the JSON-LD into the page HTML or a custom HTML block. Fine for one page. It does not scale, and every edit means re-pasting and re-validating.
The plugin route, kept editable
Paste the same code into a schema field instead of the theme. In Schemafy, Manual JSON takes raw JSON-LD and applies it to a specific page, so the markup stays out of your template and you can edit it from one screen.
The hands-off route
Skip the copy loop. Schemafy's Auto Schema Generator detects schema opportunities across the site and applies the markup for you, and the AI Schema Generator builds complex types from your content using your own ChatGPT or Claude API key. Everything applied shows up in the Rich Snippets screen, already validated on the way in.
Free editor vs. the Schemafy plugin
This tool covers writing and validating. The plugin covers getting that markup onto a real site without hand-pasting.
| Capability | This free editor | Schemafy plugin |
|---|---|---|
| Write and validate JSON-LD | Yes | Yes |
| Manual copy and paste | Yes | Not needed |
| Apply schema to WordPress automatically | No | Yes |
| Detect schema gaps across the site | No | Yes |
| Generate schema from your content with AI | No | Yes |
| Manage all applied schemas in one screen | No | Yes |
| WooCommerce product schema | No | Yes |
If you are validating the same markup by hand for the tenth page this week, that is the signal to automate it with the Schemafy plugin.
Frequently asked questions
Is this JSON-LD validator free?
Yes. Write, validate, format, and copy with no sign-up and no download.
Does valid JSON-LD guarantee a rich result?
No. Valid markup makes a page eligible for a rich result, but Google decides whether to show one based on content and policy. Treat validation as removing the technical blocker, not as a guarantee. As one example, Google retired FAQ rich results in 2026, so valid FAQPage markup no longer produces that specific snippet, even though the markup is still correct and still useful to AI crawlers.
What is the difference between a JSON-LD editor and a schema generator?
A generator builds the code from fields you fill in. An editor lets you write or paste code and validate it directly. Use the generator to create, use this editor to check and fix.
Can I validate structured data for any site?
Yes. The editor validates the JSON-LD itself, so it works regardless of platform. Applying the validated markup automatically is the WordPress-specific part, and that is what the plugin handles.
Does this replace Google's Rich Results Test?
No, it complements it. Use this editor to write and fix quickly, then confirm eligibility in Google's Rich Results Test. Different jobs, used together.
Related schema tools
Build, validate, preview. Three steps, three tools.
Final thoughts
A validator that only says pass or fail leaves you with the hard part: figuring out what broke and where. Pairing validation with an editor closes that gap, and pairing both with an honest read of what valid markup actually buys you keeps your expectations where they should be.
Use this editor to write clean, valid JSON-LD. When you are validating the same code page after page, the faster move is to let the markup apply and validate itself.
Install Schemafy free →