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JSON Schema generator

Infer a JSON Schema from a sample document.

Runs in your browser. Your input is not uploaded or saved.

Result

Add your input, then select Generate schema.

How to use it

Paste representative JSON. Download a draft 2020-12 schema describing the values present.

What to keep in mind

This infers shapes, not business rules. Fields present in one object are marked required; review before validation.

Up to 2 MB per input, with smaller limits for complex operations. Clear removes the current input and result. Numbers use JavaScript precision; unsafe integers are rejected.

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