JSON Schema Generator
Generate a JSON Schema (draft 2020-12) from your JSON data with automatic type inference.
JSON Input
JSON Schema Output
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Frequently Asked Questions
JSON Schema is a vocabulary for describing the structure and validation rules of JSON data. It defines what properties are allowed, their types, required fields, and constraints like min/max values or string patterns.
Paste a sample JSON document and click Generate. The tool analyzes the structure and types to produce a draft JSON Schema that validates documents with the same shape as your sample.
The tool generates schemas compatible with JSON Schema Draft 2020-12 (the latest draft), which is supported by most validation libraries including Ajv, jsonschema, and everit-json-schema.
Yes. The generated schema can be used directly with schema validation libraries in any language, in OpenAPI/Swagger definitions, or with form validation tools to ensure incoming data matches the expected structure.