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JSON Schema Faker
Generate realistic mock JSON data from JSON Schema definitions. Supports nested objects, arrays, enums, and custom formats.
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What is JSON Schema Faker?
JSON Schema Faker generates realistic mock JSON data from a JSON Schema definition. Instead of manually creating test data, you define the structure with a schema and this tool produces sample data that matches your specification.
It supports all JSON Schema draft versions (draft-04 through 2020-12), nested objects, arrays with min/max items, enums, string formats (email, date, uuid, uri, ipv4, ipv6, etc.), numbers with minimum/maximum, and booleans. The generated data is deterministic but randomized — useful for testing, prototyping, and demos.
How to Use
- Paste JSON Schema — Enter a valid JSON Schema definition in the left panel. Click "Example Schema" to load a sample with nested objects, arrays, enums, and formats.
- Set Count — Choose how many mock objects to generate (1-50). For array-type schemas, count controls how many items to produce.
- Generate — Click "Generate Mock Data" to produce realistic sample data that conforms to your schema.
- Copy or Download — Use the copy button or download the generated JSON as a file for use in your tests or prototypes.
Frequently Asked Questions
What JSON Schema features are supported?
The tool supports string/ number/ integer/ boolean/ array/ object types, nested properties, required fields, enums, string formats (email, date, date-time, uuid, uri, hostname, ipv4, ipv6, json-pointer), minimum/maximum for numbers, minLength/maxLength for strings, minItems/maxItems for arrays, pattern properties, additionalProperties, and $defs/definitions references.
Is the generated data truly random?
The data uses a random seed for variety, but values are constrained by your schema constraints. Strings with format specifications (like "email" or "date") produce format-valid values. Enums randomly select from the defined values. Numbers respect minimum/maximum boundaries.
What is the difference between this and the JSON Schema Generator?
The JSON Schema Generator creates a JSON Schema from existing JSON data. This tool (JSON Schema Faker) does the reverse — it generates mock JSON data from a JSON Schema. They are complementary tools: use the Generator to create schemas from data, then use the Faker to produce test data from schemas.
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