使用node express从mongodb检索数据

npm init

npm install express mongodb

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

const app = express();
const port = 3000;

const url = 'mongodb://localhost:27017';
const dbName = 'mydatabase';

MongoClient.connect(url, { useNewUrlParser: true }, (err, client) => {
  if (err) throw err;

  const db = client.db(dbName);

  // 在这里执行数据库操作
});

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

  collection.find({}).toArray((err, data) => {
    if (err) throw err;

    res.json(data);
  });
});

app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});