Developer

JSON Schema Generator From JSON

Paste example JSON and generate a starter JSON Schema in your browser.

Mark fields required when present in every object

Generated schemas are starter drafts. Review formats, enums, ranges, nullable values, and application rules before using them in production.

JSON inputJSON Schema output

How to use JSON Schema Generator From JSON

Generating a first-pass JSON Schema from an example JSON object or array.
Documenting object properties, nested objects, array items, and inferred required fields.
Starting a validation schema or API contract before editing business rules by hand.

Paste representative JSON into the input box or load the sample payload.
Choose whether object fields should be marked required.
Review the generated schema for inferred types, arrays, nested objects, and required fields before copying it.

Generated schemas are drafts based on examples, not a complete validation contract.
Use this as a JSON schema builder for structure and type inference, then add formats, enums, ranges, and custom rules manually.
Review nullable fields, enums, formats, minimums, maximums, and application-specific rules manually.

Does JSON Schema Generator upload my JSON?

No. The schema is inferred locally in your browser from the JSON you paste.

Can this infer every validation rule?

No. It can infer structure and basic types from examples, but it cannot know domain-specific rules such as allowed values or numeric ranges.

Can I generate JSON Schema from an array of objects?

Yes. Paste a representative array and the generator will infer item properties, shared fields, nested objects, arrays, and basic value types.