JSON Schema Draft 4 vs Draft 7 vs 2020-12: What Changed
JSON Schema Draft 4 vs Draft 7 vs 2020-12: key differences in vocabulary, $id, $ref behavior, unevaluatedProperties, and migration guidance.
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Tags: json, developer-tools, advanced
JSON Schema Draft 4 vs Draft 7 vs 2020-12: What Changed JSON Schema has gone through multiple drafts, and the version supported by your validator determines which keywords you can use. AWS API Gateway, OpenAPI 2.x, and many older tools default to Draft 4. Draft 7 is the most widely supported "modern" draft. The 2020-12 specification introduced breaking changes that affect how interacts with other keywords and how tuples are defined. Understanding what each draft added — and what broke between them — saves hours of debugging schema validation failures. Draft 4 — The Baseline Everyone Supports Draft 4 (published 2013) is the oldest version still in widespread active use. If you need maximum validator compatibility, write to Draft 4. Its core vocabulary covers: , , , (as either a schema or a…
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