JSON Schema Generator

What is a JSON Schema Generator?

A JSON Schema generator inspects a sample JSON value and creates a starter schema that describes the observed object properties, required fields, arrays, scalar types, nested shapes, and null values. It is a fast way to begin documenting API responses, validating fixtures, and drafting contracts from real payloads.

JSONFather generates a draft 2020-12 schema locally in your browser. The result should be reviewed before production use because one sample cannot prove every allowed value, format, enum, range, or optional field, but it gives teams a structured starting point.

How to Generate JSON Schema

Paste a representative JSON sample and choose Generate Schema. Review required properties, inferred types, array item shapes, and any anyOf branches. Add business rules such as formats, enums, min/max values, descriptions, and optional fields before using the schema as an API contract.

Available actions

• Generate Schema
• Import JSON file
• Copy output
• Download output
• Create expiring JSON share link
• Collapse all
• Expand all
• Escape JSON string
• Unescape JSON string
• Generate sample JSON
• Simple sample
• Medium sample
• Complex sample
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• Find in editor
• Previous match
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• Replace all
• Close search panel

Example

{"name":"jsonfather","age":1,"features":["format","validate"]}

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object"
}