From 0be2a7fed9765f0431ce595778a7bab9792a4e4d Mon Sep 17 00:00:00 2001
From: Hampus <hampus@fluxer.app>
Date: Sat, 15 Aug 2026 21:01:43 +0200
Subject: [PATCH] feat(openapi): recognise the modern Zod integer formats
 (#1649)

---
 packages/openapi/src/converters/ZodInternals.ts           | 2 ++
 .../openapi/src/converters/ZodToOpenAPIIntrospection.ts   | 8 ++++++++
 2 files changed, 10 insertions(+)

diff --git a/packages/openapi/src/converters/ZodInternals.ts b/packages/openapi/src/converters/ZodInternals.ts
index 0552f1c64..607b798e9 100644
--- a/packages/openapi/src/converters/ZodInternals.ts
+++ b/packages/openapi/src/converters/ZodInternals.ts
@@ -74,6 +74,8 @@ interface ZodInternalDefinition {
 	getter?: () => ZodTypeAny;
 	pattern?: RegExp;
 	transform?: (input: unknown) => unknown;
+	check?: string;
+	format?: string;
 }
 
 interface ZodInternalSchema {
diff --git a/packages/openapi/src/converters/ZodToOpenAPIIntrospection.ts b/packages/openapi/src/converters/ZodToOpenAPIIntrospection.ts
index ea3be86ac..586a5bc4f 100644
--- a/packages/openapi/src/converters/ZodToOpenAPIIntrospection.ts
+++ b/packages/openapi/src/converters/ZodToOpenAPIIntrospection.ts
@@ -258,6 +258,7 @@ export function extractStringConstraints(schema: ZodTypeAny): {
 	if (stringProperties._regex != null) result.pattern = stringProperties._regex.source;
 	return result;
 }
+const INTEGER_NUMBER_FORMATS = new Set(['safeint', 'int32', 'uint32']);
 export function extractNumberConstraints(schema: ZodTypeAny): {
 	minimum?: number;
 	maximum?: number;
@@ -277,6 +278,13 @@ export function extractNumberConstraints(schema: ZodTypeAny): {
 		if (check.isInt === true) result.isInt = true;
 		if (check.format != null) result.format = check.format;
 	}
+	const definition = getZodDefinition(schema);
+	if (definition.check === 'number_format' && definition.format != null) {
+		result.format = definition.format;
+		if (INTEGER_NUMBER_FORMATS.has(definition.format)) {
+			result.isInt = true;
+		}
+	}
 	return result;
 }
 export function getDefaultValue(schema: ZodTypeAny): unknown {