Web Tools
JSON Schema Generator
Generate JSON Schema from a JSON sample. Paste any JSON and get a valid JSON Schema (draft 2020-12) with type inference, nested object support, and array item schemas. Runs entirely in your browser.
json schema generator validation api developer-tools
Published May 28, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Paste any JSON value (object, array, or primitive) and get an auto-generated JSON Schema (draft 2020-12). The generator infers types, builds nested object schemas with properties and required fields, and detects homogeneous vs heterogeneous arrays.
Supported Types
| JSON Type | Schema Type |
|---|---|
| String | "string" |
| Integer | "integer" |
| Float | "number" |
| Boolean | "boolean" |
| Null | "null" |
| Array | "array" with items |
| Object | "object" with properties and required |
Features
- Automatic type inference — detects string, integer, number, boolean, null, array, object
- Nested schema generation — handles deeply nested objects and arrays
- Array item schemas — homogeneous arrays get typed items, heterogeneous get type unions
- Required fields — optional toggle for
requiredarray generation - Title and description — add optional metadata to the root schema
- JSON Schema draft 2020-12 compliant output
- One-click copy — copy generated schema to clipboard
- Private: runs entirely in the browser — no data transmitted