New project structure

New folder structure
Changed to type:module
Moved routes to separate files

services/validation.js

@@ -0,0 +1,32 @@
+import Restaurant from "../models/restaurant.js";
+import Dish from "../models/dish.js";
+import User from "../models/users.js";
+import mongoose from "mongoose";
+
+export function validateRestaurant(id, callback) {
+  if (mongoose.Types.ObjectId.isValid(id)) {
+    Restaurant.exists({ _id: id }, (err, res) => {
+      if (err) {
+        callback(false);
+      } else {
+        callback(res);
+      }
+    });
+  } else callback(false);
+}
+
+export function validateUser(id, callback) {
+  callback(true);
+}
+
+export function validateDishId(id, callback) {
+  if (mongoose.Types.ObjectId.isValid(id)) {
+    Dish.exists({ _id: id }, (err, res) => {
+      if (err) {
+        callback(false);
+      } else {
+        callback(res);
+      }
+    });
+  } else callback(false);
+}