make utils.js

+import jwt from "jsonwebtoken";
+import { PrismaClient } from "@prisma/client";
+
+export const APP_SECRET = "a"; // TODO : value update to object
+
+export const prisma = new PrismaClient();
+
+export const getUserId = (context) => {
+  const Authorization = context.request.get("Authorization");
+  if (Authorization) {
+    const token = Authorization.replace("Bearer ", "");
+    const { userId } = jwt.verify(token, APP_SECRET);
+    return userId;
+  }
+  throw new Error("There is no vaild user");
+};