JSON Schema Generator
Convert valid JSON objects into JSON Schema (Draft 7) definitions automatically. Essential for API validation and documentation.
Input JSON
JSON Schema
About
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. Writing schemas from scratch can be tedious. This tool takes a JSON instance (example data) and generates a structural schema matching that data, inferring types like String, Integer, Boolean, and Arrays.
schema
api development
data validation
Formulas
Inference Logic:
IF value is Array -> type: 'array', items: detect_type(first_element)
IF value is Object -> type: 'object', properties: recurse_keys(value)
IF value is Number -> type: 'number' or 'integer'
IF value is Object -> type: 'object', properties: recurse_keys(value)
IF value is Number -> type: 'number' or 'integer'
Reference Data
| JSON Type | Schema Type | Example |
|---|---|---|
| "text" | string | "name": "John" |
| 123 | integer | "age": 30 |
| true | boolean | "active": true |
| [1,2] | array | "ids": [1, 2] |
Frequently Asked Questions
This generator outputs a schema compatible with Draft-07.
This simple generator looks at the first item in an array to determine the schema type for all items. Complex mixed types default to `type: string` or generic objects in simplified modes.