如何将NodeJS上的登录数据与MongoDB中的注册用户进行比较

const express = require('express');
const { MongoClient } = require('mongodb');
const bcrypt = require('bcrypt');

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

// 连接到MongoDB数据库
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri);

app.use(express.json());

app.post('/login', async (req, res) => {
  const { username, password } = req.body;

  try {
    await client.connect();
    const db = client.db('mydb');
    const collection = db.collection('users');

    // 在MongoDB中查找对应的注册用户
    const user = await collection.findOne({ username });

    if (user) {
      // 比较密码是否匹配
      const isPasswordMatch = await bcrypt.compare(password, user.password);

      if (isPasswordMatch) {
        res.send('登录成功');
      } else {
        res.send('密码错误');
      }
    } else {
      res.send('用户不存在');
    }
  } catch (error) {
    console.error(error);
    res.status(500).send('服务器错误');
  } finally {
    await client.close();
  }
});

app.listen(port, () => {
  console.log(`服务器运行在 http://localhost:${port}`);
});