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.
Paste JSON and click Generate to produce a draft-07 JSON Schema.
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.
Frequently asked questions
Which JSON Schema version is generated?
Draft-07.
What is inferred from the data?
Required fields, value types, array items, and nullability are all derived from your JSON.
Does JSON to JSON Schema upload my data?
No. JSON to JSON Schema runs entirely in your browser — your input never leaves this page.
Is JSON to JSON Schema free to use?
Yes. JSON to JSON Schema is completely free, with no account and nothing to sign up for.