Which JSON Schema drafts are supported?

The generator supports Draft-04, Draft-07, 2019-09, and 2020-12, including type assertions, formats, enums, required properties, and internal $defs/$ref pointer resolution.

Can I generate multiple mock records simultaneously?

Yes. Select 1, 5, 10, or 25 records from the dropdown to produce a synthetic array of conforming mock JSON records.

Are my schemas sent over the internet?

No. The mock synthesis algorithm runs entirely inside your client browser tab with zero network transmission.

JSON Schema Mock Generator

Synthesize realistic, conforming sample JSON objects and arrays from any JSON Schema definition with formats, regex patterns, enums, and nested hierarchies.

100% Client-Side Privacy

JSON Schema Definition Valid Schema

Generated Mock JSON 0 bytes

Frequently Asked Questions

Which string formats are supported?

The mock generator handles date-time, date, time, email, uuid, hostname, ipv4, ipv6, and uri, producing syntactically valid values for each.

How are numeric bounds evaluated?

When schemas include minimum and maximum (or exclusiveMinimum / exclusiveMaximum), generated integers and floats will always fall strictly within the specified range.

Does the generator support $ref schemas?

Yes. Internal references using $ref: "#/$defs/TypeName" or "#/definitions/TypeName" are recursively traversed and synthesized.

Is any of my schema or generated data stored?

No. 100% of schema parsing and data generation happens locally in your browser with zero remote connections.