Nullability Drift Inspector
Detect fields that changed from required to optional, nullable drift, and null-type changes across schema versions. Free schema diff tool by Graph Tools.
Use this free nullability drift inspector to detect schema fields that changed their required status or nullability between two API versions. Paste two OpenAPI or JSON Schema documents and get a report of fields that became required, dropped from required, gained a nullable type, or lost null support. These silent contract changes often break client code without triggering a version bump. Valuable for API developers and integration teams.