JSON Schema Design: Required Fields, Types, and $ref Patterns
JSON Schema design patterns: required fields, $ref, allOf/anyOf/oneOf, and discriminator. Practical guide for API contracts and form validation.
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Tags: json, developer-tools, validation
JSON Schema Design: Required Fields, Types, and $ref Patterns JSON Schema is a vocabulary for annotating and validating JSON documents. A well-designed schema is a contract between a data producer and a data consumer. It documents the expected shape, enables validation before runtime errors occur, and drives editor tooling that makes working with the data format faster and less error-prone. Schema Structure Basics A JSON Schema document is itself a JSON object. At minimum, it describes the type of the root value: The field identifies the draft version of JSON Schema in use. Always include it. Different drafts (Draft 4, Draft 7, Draft 2019-09, Draft 2020-12) have subtle behavioral differences, and validators will use the correct rules for the specified draft. The field is the canonical URI…
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