How to document null values: OpenAPI 3.1.0 drops nullable — use type: null?

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

Authors

Publication Details

Journal
Zenodo (CERN European Organization for Nuclear Research)
Published
2026-10-26
DOI
https://doi.org/10.5281/zenodo.23674521
Primary Topic
Service-Oriented Architecture and Web Services
Type
preprint
Controls
|||
ALL TIME
JAN
FEB
MAR
APR
MAY
JUN
JUL
AUG
SEP
OCT
preprint

How to document null values: OpenAPI 3.1.0 drops nullable — use type: null?

Brady Weaver
Zenodo (CERN European Organization for Nuclear Research)
Service-Oriented Architecture and Web Services
preprint

How to document null values: OpenAPI 3.1.0 drops nullable — use type: null?

Brady Weaver
preprint en

Abstract

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

Zenodo (CERN European Organization for Nuclear Research)
Service-Oriented Architecture and Web Services
DOIOpen Access PDFOpenAlex
AI Navigator

Ask Laika to Summarize, Analyze, and Connect papers live on the map.

Summarize Papers & Methodologies

Extract key findings, datasets, and comparative methods across publications.

Benchmark Rankings & Visual Analytics

Rank top research institutions, authors, funders, topics, and journals by Field-Weighted Citation Impact (FWCI) and paper volume with instant charts.

Connect Distant Disciplines

Bridge topological clusters on the map to find hidden collaborative intersections.

Laika access coming soon
How to document null values: OpenAPI 3.1.0 drops nullable — use type: null? — Brady Weaver · Zenodo (CERN European Organization for Nuclear Research) (2026) | TGRS Research Map | TGRS