使用Express发送MongoDB find()的结果

npm install express mongodb

const express = require('express');
const MongoClient = require('mongodb').MongoClient;

const app = express();
const url = 'mongodb://localhost:27017'; // MongoDB连接URL
const dbName = 'mydatabase'; // 数据库名称

MongoClient.connect(url, { useNewUrlParser: true }, (err, client) => {
  if (err) {
    console.error('Failed to connect to MongoDB:', err);
    return;
  }

  console.log('Connected to MongoDB successfully');
  const db = client.db(dbName);

  // 在这里执行查询操作
});

app.get('/data', (req, res) => {
  const collection = db.collection('mycollection'); // 集合名称

  collection.find({}).toArray((err, result) => {
    if (err) {
      console.error('Failed to execute find() query:', err);
      res.status(500).send('Internal Server Error');
      return;
    }

    res.json(result); // 将查询结果作为JSON响应发送给客户端
  });
});