JSON Schema Generator

Generate a Draft 2020-12 JSON Schema from any JSON document. Infers nested objects, arrays, required fields, primitive types, and candidate enum values.

JSON Schema Generator Use Cases

Bootstrap API contracts from real sample payloads before formal schema design
Create validation schemas for test fixtures and mock data generation
Quickly document nested JSON event formats for integrations
Prepare a baseline schema before refining constraints manually

JSON Schema Generator FAQ

How are required fields detected?

For objects, keys that appear in all observed entries are marked as required. Missing keys are treated as optional.

How are enums inferred?

When a field has a small, repeating set of scalar values, the generator adds an enum to capture those likely categories.

Which JSON Schema draft is generated?

The output includes the JSON Schema Draft 2020-12 $schema URI and uses standard keywords such as type, properties, required, anyOf, and items.