使用 react-native 应用程序连接到 MongoDB Atlas Cluster db

I want to take that data and then use the following code (from the Atlas Site Connection String) to connect and check.

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb+srv://<userName>:<password>@testcluster1-dbdq3.mongodb.net/test?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
  const collection = client.db("test").collection("devices");
  // perform actions on the collection object
  client.close();
});

既然react-native建立了服务器，那还需要Express吗?我对此很陌生，所以我仍在尝试找出要使用的软件包.我是否还应该安装 mongoose 或 mongoDB 或两者都安装(来自 NPM).我试图从基本的角度和所需的包来了解它是如何工作的.