Developer Tools
JSON Schema Faker

JSON Schema Faker

Generate realistic sample JSON instances from a JSON Schema in your browser.

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Generate sample JSON from a schema

Need realistic fixtures for unit tests or mock APIs? Paste a JSON Schema and the tool produces a sample document that respects types, enums, and array bounds using the json-schema-faker engine in your browser.

After generating data, validate it with JSON Schema Validator or convert it to typed models via JSON to TypeScript.

Frequently Asked Questions

Why do optional properties appear?

By default the generator may fill optional properties so you can preview a rich object. Enable Generate required properties only to keep the output minimal.

Will I get the same sample every time?

Values are pseudo-random. Re-run generation or tweak the schema when you need another fixture; the output is not seeded for reproducibility.