Free structured data tool

Structured Data Validator

Check pasted JSON-LD or HTML for JSON syntax, detected entity types and a few common property gaps. Your input is checked in this browser; it is not uploaded.

Paste JSON-LD or page HTML

Up to 250,000 characters. Paste JSON-LD directly or the HTML containing its script blocks.

The server fetch is rate-limited, size-capped and protected against private-network destinations and unsafe redirects.

Findings

Results appear as you paste input

Paste structured data to begin

Paste JSON-LD or HTML containing application/ld+json script blocks. Nothing is sent to a server.

Official tools for deeper checks

This utility is a quick syntax and property review, not a full Schema.org or Google eligibility validator.