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JSON Schema Generator

Used by developers, writers, and creators worldwide.

A JSON Schema generator produces example JSON Schema definitions — the standard way to describe, validate, and document the shape of JSON data. Whether you are validating an API request body, documenting a payload, or learning the schema syntax, a well-formed example is the fastest starting point. Each generated schema defines an entity such as a user, product, or order, with typed properties, required fields, formats like email and uuid, and constraints like minimum values. It follows the current JSON Schema draft, so it drops straight into a validator or your API documentation. Adapt the properties to your real data, and you have a working schema without writing the boilerplate by hand.

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How to use

  1. Choose your options above
  2. Click Generate
  3. Copy your result

Detailed instructions

  1. Choose an entity — user, product, or order.
  2. Click Generate to produce a JSON Schema definition.
  3. Adapt the properties, required fields, and constraints to your data.
  4. Drop it into a validator or your API documentation.

Use Cases

  • •Validating API request and response bodies
  • •Documenting the shape of a JSON payload
  • •Learning JSON Schema syntax with real examples
  • •A starting point for your own schema
  • •Fixtures for testing schema validation

Tips

  • →List only genuinely required fields in "required" so optional data validates.
  • →Use formats like email, uuid, and date-time for stricter validation.
  • →Match the $schema draft to what your validator library supports.
  • →Keep the schema in sync with your real data as it evolves.

FAQ

what is json schema

JSON Schema is a standard vocabulary for describing the structure of JSON data — its types, required fields, formats, and constraints. It is used to validate data, document APIs, and generate forms and code, providing a single source of truth for what valid JSON looks like.

how do i validate data against a schema

Use a JSON Schema validator library for your language — there are mature ones for JavaScript, Python, and most others. You pass the schema and the data, and the validator reports whether the data conforms and, if not, exactly which rules it violates.

which draft does this use

The generated schemas declare the current draft (2020-12) in the $schema field. Most modern validators support it, but if your tooling targets an older draft, adjust the $schema URL and check that any keywords you use are supported in that version.