JSON to JSON Schema
Infer a JSON Schema from a sample object or array. Types, properties, and required keys are derived in the tab. A starting point for API contracts, not a full draft-2020 generator.
Runs in your browser. Nothing is uploaded.
About this tool
Infer a JSON Schema from a sample. Object keys become properties; the first array item sets items. Required lists every key present in the sample.
How to use: paste JSON, copy the schema. Nested objects recurse. This is a sketch, not draft-2020 with $ref and formats.
Example: {"id":1,"name":"Ada"} yields integer and string properties. Related: JSON formatter to tidy the sample first.
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