JSON-LD Schema Nested Entity Builder
Build structured data visually, connect nested Schema.org entities, and export clean JSON-LD without sending your content to a server.
Builder
Results
Introduction
JSON-LD structured data often requires nested entities. A product may need offers, reviews, aggregate ratings, and brand information. An article may need author, publisher, and image entities.
This builder helps you assemble those relationships visually and export clean JSON-LD.
How it works
The tool maintains a local entity tree. Each entity has a type, optional identifier,
common fields, custom properties, and nested child entities. Child entities are
attached using a relationship property such as author,
offers, or mainEntity.
- No data leaves your browser.
- Duplicate property values are converted into arrays automatically.
- Numeric and boolean-looking values are converted to JSON primitives.
- Validation is advisory and does not replace official testing.
How to use
- Select or type the root entity type.
- Add common fields such as name, URL, and description.
- Add custom properties if needed.
- Add nested entities and set their relationship property.
- Generate and copy the JSON-LD.
Practical example
A Product entity can include an Offer, AggregateRating, Review, and Brand. Use the example loader to see how these nested entities are represented in JSON-LD.
Use cases
- Building product structured data for e-commerce pages.
- Creating article schema with author and publisher.
- Generating FAQPage schema from questions and answers.
- Prototyping schema before adding it to templates.
- Learning how nested Schema.org entities relate to each other.
Best practices
- Only mark up content visible or available on the page.
- Use stable
@idvalues where helpful. - Keep property names aligned with Schema.org vocabulary.
- Test output with structured data validation tools.
- Avoid adding schema types that do not match the page content.
Common mistakes
- Nesting entities under incorrect relationship properties.
- Omitting required or strongly recommended fields.
- Using duplicate
@idvalues. - Adding ratings or reviews that do not exist on the page.
- Generating invalid JSON through manual editing.
Limitations
- The tool provides advisory validation, not full schema certification.
- It does not verify whether markup matches live page content.
- Search engines may apply additional eligibility requirements.
- Very complex graphs may be easier to maintain in templated code.
Browser compatibility
The tool works in current versions of major browsers. The generated JSON-LD can be used in any standard HTML page.
FAQ
Is my structured data uploaded?
No. All entity data is processed locally in your browser.
Can I add custom properties?
Yes. Use the Additional Properties section to add any Schema.org property or custom key-value pair.
Does this guarantee rich results?
No. Structured data eligibility depends on content quality, policy compliance, and search engine systems.
How should I include the output in a page?
Place the JSON-LD inside a
<script type="application/ld+json"> tag in the HTML head or
body.