Schema & Structured Data Tools

Online Schema Validator

Online Schema Validator validates pasted JSON-LD structured data in your browser. Free, with no sign-up. Nothing is uploaded.

Client-sideRuns entirely in your browser — your data never leaves your device.

Online Schema Validator is a browser-based web developer tool on WebDevToolsBase. Online Schema Validator validates pasted JSON-LD structured data in your browser. Free, with no sign-up. Nothing is uploaded. To use it, paste your input and view the result directly in your browser — no signup and nothing to install.

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Online Schema Validator is a free Schema & Structured Data Tools utility that runs entirely in your browser — nothing you enter is uploaded.

Validation report


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How to use Online Schema Validator

  
    
      
  1. Drop your text into the field at the top of Online Schema Validator.
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  2. Adjust the Paste JSON-LD or a <script type=application/ld+json> block option to match what you need.
    3. 
      
  3. Watch the output update instantly while you adjust the text.
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  4. Finish by choosing Copy to take the output with you.
    5. 
  

  
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About this tool

  
There is no server behind Online Schema Validator. Online Schema Validator assembles valid JSON-LD locally so you can paste it into your page.

  
Everything is generated on your device with nothing uploaded. Your input never leaves the page, and no account or install is required.

  
Frequently asked questions

  

      
What does Online Schema Validator do?
Use Online Schema Validator to validate your input without installing anything using the Paste JSON-LD or a <script type=application/ld+json> block control; everything happens client-side.

      
Does Online Schema Validator cost anything?
No — Online Schema Validator is completely free, with no sign-up and no hidden limits.

      
Is my input private in Online Schema Validator?
Yes — your input never leaves your device; Online Schema Validator does all the work in your browser.

      
Does Online Schema Validator validate against schema.org types?
Online Schema Validator builds and checks the structured-data markup in your browser so you can paste it straight into your page.

      
Does Online Schema Validator work offline?
Once the page has loaded, Online Schema Validator keeps working with no network connection.

  

  
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