JSON to JSON Schema
Convert JSON to a draft-07 JSON Schema. Required fields, value types, array items, and nullability are derived from your data. Runs entirely in your browser.
JSON input
Generated JSON Schema
What this tool does
This JSON to JSON Schema converter takes a JSON document and generates JSON Schema type definitions from its shape. It runs entirely in your browser — your data never leaves the page.
How it works
1. Infer types. Every value is inspected: strings, numbers, booleans, null, arrays and nested objects.
2. Merge shapes. Array items are merged so optional fields stay optional.
3. Name fields. Keys become valid target-language identifiers.
4. Emit code. JSON Schema definitions preserve original JSON keys.