Is my JSON data uploaded to a server?

No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

Which JSON Schema draft is generated?

The tool produces JSON Schema draft 2020-12. The schema is fully inlined, without $defs, so it is easy to read and to embed anywhere.

Are all properties marked as required?

Yes. Every key seen in your sample is listed in the required array. Integers and floats are also distinguished as integer and number types.

JSON to JSON Schema Converter

JSON to JSON Schema Converter — Free Online Tool

Generate a JSON Schema (draft 2020-12) from sample JSON in your browser. Free, private and offline-friendly: your data never leaves your device.

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Indentation

JSON input

JSON Schema output

Why convert JSON to JSON Schema?

Writing a JSON Schema by hand for an existing payload is tedious. Paste a sample JSON document above and get a complete draft 2020-12 schema in milliseconds, ready for validation, documentation or code generation.

How it works

The converter parses your JSON locally and infers a fully inlined schema (no $defs). All keys seen in the sample become required, integers are typed as integer and floats as number, and heterogeneous arrays are described with anyOf.

Frequently asked questions

Is my JSON data uploaded to a server?: No. The conversion runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
Which JSON Schema draft is generated?: The tool produces JSON Schema draft 2020-12. The schema is fully inlined, without $defs, so it is easy to read and to embed anywhere.
Are all properties marked as required?: Yes. Every key seen in your sample is listed in the required array. Integers and floats are also distinguished as integer and number types.