Create a starter schema from JSON data
When a JSON instance already expresses the structure you need to model, the built-in generator can create a basic JSON Schema without retyping every property and obvious type. It is a starting point for review, not proof that all allowed and required cases have been captured.
Run the generation command
- Open the source JSON data in JSONBuddy; the retained workflow supports either text or grid view.
- Choose JSON | Generate JSON schema from document.
- Review the new schema document, its inferred basic types, and its generated definitions.
- Add the constraints, descriptions, examples, and test cases needed for the actual data contract.
The legacy page says nested objects are added as definitions and equal object definitions occur once. Confirm generated draft, naming, reuse detection, arrays, null handling, required-property behavior, and command availability against the release candidate.
Understand background generation separately
The production article also describes a generated schema used in the background for JSON documents with no assigned schema, supporting the Elements pane and entry helpers. Do not treat that assistance as an explicit saved schema or as a substitute for assigning, reviewing, and validating the intended contract.
Move from a draft to a verified contract
Continue in the JSON Schema editor, assign the reviewed schema to representative data, then use the JSON Schema tester to exercise it with a collection.