diff --git a/app/__test__/data/specs/fields/PrimaryField.spec.ts b/app/__test__/data/specs/fields/PrimaryField.spec.ts
index 6be0166..c40ee14 100644
--- a/app/__test__/data/specs/fields/PrimaryField.spec.ts
+++ b/app/__test__/data/specs/fields/PrimaryField.spec.ts
@@ -39,4 +39,28 @@ describe("[data] PrimaryField", async () => {
       expect(field.transformPersist(1)).rejects.toThrow();
       expect(field.transformRetrieve(1)).toBe(1);
    });
+
+   test("format", () => {
+      const uuid = new PrimaryField("uuid", { format: "uuid" });
+      expect(uuid.format).toBe("uuid");
+      expect(uuid.fieldType).toBe("text");
+      expect(uuid.getNewValue()).toBeString();
+      expect(uuid.toType()).toEqual({
+         required: true,
+         comment: undefined,
+         type: "Generated<string>",
+         import: [{ package: "kysely", name: "Generated" }],
+      });
+
+      const integer = new PrimaryField("integer", { format: "integer" });
+      expect(integer.format).toBe("integer");
+      expect(integer.fieldType).toBe("integer");
+      expect(integer.getNewValue()).toBeUndefined();
+      expect(integer.toType()).toEqual({
+         required: true,
+         comment: undefined,
+         type: "Generated<number>",
+         import: [{ package: "kysely", name: "Generated" }],
+      });
+   });
 });
diff --git a/app/src/data/fields/PrimaryField.ts b/app/src/data/fields/PrimaryField.ts
index efcfd6f..2f83c20 100644
--- a/app/src/data/fields/PrimaryField.ts
+++ b/app/src/data/fields/PrimaryField.ts
@@ -67,6 +67,10 @@ export class PrimaryField<Required extends true | false = false> extends Field<
    }
 
    override toJsonSchema() {
+      if (this.format === "uuid") {
+         return this.toSchemaWrapIfRequired(Type.String({ writeOnly: undefined }));
+      }
+
       return this.toSchemaWrapIfRequired(Type.Number({ writeOnly: undefined }));
    }