使用节点麻烦在mongodb中列出集合

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我在通过节点在mongodb中列出集合时遇到问题。要设置mongo，我做了以下工作：

brew tap mongodb/brew
brew install mongodb-community@4.2
brew services start mongodb-community@4.2

然后，我像这样创建了一个数据库和集合：

mongo
use mongo-crud
db.createCollection('dogs')

我可以通过命令行看到数据库和集合已成功创建。现在我的节点应用程序是这样的：

const MongoClient = require('mongodb').MongoClient;
// Assert is not really needed though we can use it to check for errors
const assert = require('assert');

// Note that this is the default port that must be used
const url = 'mongodb://localhost:27017';

const dbName = 'mongo-crud';

// useUnifiedTopology is needed to hide a warning
const client = new MongoClient(url, { useUnifiedTopology: true });

// Use connect method to connect to the Server
client.connect(function(err) {
  assert.equal(null, err);
  console.log("Connected successfully to server");

  const db = client.db(dbName);
  db.listCollections().toArray(function(err, collInfos) {
    console.log(err)
    assert.equal(err, null);
  });

  client.close();
});

There doesn't seem to be an issue connection to the database but when I try to list the collections it throws an error name: 'MongoError' [Symbol(mongoErrorContextSymbol)]: {}. What am I doing wrong here?

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