Published October 26, 2026
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How to document null values: OpenAPI 3.1.0 drops nullable — use type: null?
Authors/Creators
Description
OpenAPI 3.1.0 drops nullable; use type: null in Swagger UI 5.x. pandas 3.0.6 splits dtype inference, and Jakarta Annotations 2.1.1 changes null checks.
Independent technical note mirroring the canonical version: https://specswriter.com/blog/how-to-document-null-values-openapi-310-drops-nullable-use-type-null.php
Notes
Independent analysis; not peer-reviewed.