fixing auth check and content type error

packages/api/services/user.service.ts

@@ -6,8 +6,21 @@ import axios from "axios";
 import { collections } from "./database.service";
 
 export class UserService {
-  static async getUserByGoogleId(userId: string) {
-    const query = { googleId: userId };
+  static async getUserById(userId: string) {
+    const query = { _id: userId };
+
+    const res = await collections.users?.findOne(query);
+
+    // exists
+    if (res?._id) {
+      return res as User;
+    }
+
+    return null;
+  }
+
+  static async getUserByGoogleId(googleUserId: string) {
+    const query = { googleId: googleUserId };
 
     const res = await collections.users?.findOne(query);