JSON-LD Validator Validate JSON-LD structured data syntax and check for common schema.org errors.

🔍

JSON-LD Validator

Validate JSON-LD structured data syntax and check for common schema.org errors.

Paste your JSON-LD

Paste your JSON-LD code including the script tags or just the JSON object.

Review validation results

The validator checks JSON syntax, Schema.org types, and required properties.

Fix errors and re-validate

Address any errors or warnings and validate again until clean.

Loading tool...

What Is JSON-LD Validator?

The JSON-LD Validator checks your structured data for syntax errors, malformed JSON, and common Schema.org issues. It parses the JSON-LD, validates the structure, checks for required @context and @type properties, and identifies formatting problems that could prevent search engines from reading your structured data. While Google's Rich Results Test checks if your schema qualifies for rich results, this tool focuses on the JSON-LD syntax level — ensuring your code is valid before deployment.

Why Use JSON-LD Validator?

Real-time JSON syntax validation with detailed error messages
Checks for required @context and @type properties
Identifies common formatting issues and malformed values
Validates nested objects and array structures
Formats and prettifies JSON-LD output for readability

Common Use Cases

Pre-Deployment Check

Validate structured data before pushing to production.

Debugging

Find syntax errors in complex nested schema markup.

Learning

Understand JSON-LD structure by testing examples.

Quality Assurance

Verify CMS-generated structured data is well-formed.

Technical Guide

JSON-LD (JavaScript Object Notation for Linked Data) is the format recommended by Google for structured data. It uses standard JSON syntax with special keywords: @context (typically "https://schema.org"), @type (the Schema.org type), and @id (optional unique identifier). Common syntax errors include: trailing commas, unquoted property names, single quotes instead of double quotes, and unescaped special characters in strings. The validator parses the JSON using the browser's native JSON.parse() and then checks for Schema.org-specific requirements.

Tips & Best Practices

1
Always use double quotes in JSON-LD — single quotes cause parse errors
2
Remove trailing commas after the last property in objects and arrays
3
Use the prettified output for easier reading and debugging
4
Test with Google Rich Results Test after syntax validation
5
Check that @context is set to "https://schema.org"

Related Tools

Organization Schema Generator

Generate Schema.org Organization JSON-LD structured data markup.

🔍 SEO Tools

Product Schema Generator

Generate Schema.org Product JSON-LD with price, availability, ratings, and review data.

🔍 SEO Tools

Article Schema Generator

Generate Schema.org Article JSON-LD for blog posts, news, and editorial content.

🔍 SEO Tools

FAQ Schema Generator

Generate Schema.org FAQPage JSON-LD for expandable FAQ rich results in Google search.

🔍 SEO Tools

Frequently Asked Questions

Q What is JSON-LD?

JSON-LD (JSON for Linked Data) is a structured data format that uses standard JSON syntax. Google recommends JSON-LD over Microdata and RDFa for implementing Schema.org markup.

Q Where does JSON-LD go in HTML?

Place JSON-LD in a <script type="application/ld+json"> tag, typically in the <head> or at the end of the <body>. It can go anywhere in the HTML document.

Q What is the difference between this and Google Rich Results Test?

This tool validates JSON-LD syntax. Google Rich Results Test checks if your structured data qualifies for specific rich result types and displays a preview.

About This Tool

JSON-LD Validator is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.