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src/server/api/categories.get.ts

@@ -1,3 +1,10 @@
-export default defineEventHandler(async () => {
-  return await usePrisma().category.findMany()
+import type { CategoryType } from '@prisma/client'
+
+export default defineEventHandler(async (event) => {
+  const { type } = getQuery<{ type: CategoryType }>(event)
+  return await usePrisma().category.findMany({
+    where: {
+      type,
+    },
+  })
 })