const express = require("express");
const bodyParser = require("body-parser");
const { MongoClient } = require("mongodb");

const app = express();

app.set('view engine', 'ejs');

app.use(bodyParser.urlencoded({extended: true}));
app.use(express.static("public"));

const uri =
 "mongodb+srv://username:1234321@cluster0.8imjcky.mongodb.net/?retryWrites=true&w=majority";

const client = new MongoClient(uri);

async function run() {
 try {
   const todolistDB = client.db("todolistDB");
   const dbItem = todolistDB.collection("Item");
  
   const defaultItems = [
     { item1: "welcome to your todolist" },
     { item2: "add new Item"},
     { item3: "delete item"}
   ];

const result = await dbItem.insertMany(defaultItems);
 console.log(`${result.insertedCount} documents were inserted`);
} finally {
 await client.close();
}
}
run().catch(console.dir);

app.get("/", function(req, res) {
  //const dbItem = app.locals.collection;
  dbItem.find({}, function(err, foundItems){
    res.render("list", {listTitle: "Today", newListItems: foundItems});
  });

这是我编写的连接到我的Mongo Atlas的代码。应用程序连接到Atlas，并且已经在Atlas中创建了dbItem数据库。
然而，当尝试我的运行服务器在终端中出现此错误：第一个月
我也试过在app.get函数之前使用app.locals.collections = dbItem，但效果不佳。