Windows下Node.js连接MongoDB遇MongoServerSelectionError求助

环境：Windows系统，MongoDB 6.0.6，Node.js 18.16.0
现象：注册表单提交后终端能正常打印请求数据，但无法建立数据库连接，报错如上。

index.js代码 #

var express = require('express');
var router = express.Router();
var MongoClient = require('mongodb').MongoClient;

/* GET home page. */
router.get('/', function(req, res, next) {
  res.render('index', { title: 'Express' });
});
router.post('/submit',function(req,res){
  console.log(req.body)
  MongoClient.connect("mongodb://localhost:27017",function(err,client){
    if(err)
      console.log('ERROR')
    else
      client.db('mydata').collection('user').insertOne(req.body)
  })

  res.send("Got it")
}) 
module.exports = router;

终端错误信息 #

POST /submit 200 31.648 ms - 6
[Object: null prototype] {
  first_name: 'tetew',
  last_name: 'fff',
  email: 'gggg',
  pw: 'fdf',
  pw_confirm: 'gg'
}
POST /submit 200 4.917 ms - 6
E:\Web\New Database\node_modules\mongodb\lib\sdam\topology.js:278
                const timeoutError = new error_1.MongoServerSelectionError(`Server selection timed out after ${serverSelectionTimeoutMS} ms`, this.description);
                                     ^

MongoServerSelectionError: connect ECONNREFUSED ::1:27017
    at Timeout._onTimeout (E:\Web\New Database\node_modules\mongodb\lib\sdam\topology.js:278:38)
    at listOnTimeout (node:internal/timers:569:17)
    at process.processTimers (node:internal/timers:512:7) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) {
      'localhost:27017' => ServerDescription {
        address: 'localhost:27017',
        type: 'Unknown',
        hosts: [],
        passives: [],
        arbiters: [],
        tags: {},
        minWireVersion: 0,
        maxWireVersion: 0,
        roundTripTime: -1,
        lastUpdateTime: 58231053,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (E:\Web\New Database\node_modules\mongodb\lib\cmap\connect.js:370:20)
            at Socket.<anonymous> (E:\Web\New Database\node_modules\mongodb\lib\cmap\connect.js:293:22)
            at Object.onceWrapper (node:events:628:26)
            at Socket.emit (node:events:513:28)
            at emitErrorNT (node:internal/streams/destroy:151:8)
            at emitErrorCloseNT (node:internal/streams/destroy:116:3)
            at process.processTicksAndRejections (node:internal/process/task_queues:82:21) {
          cause: Error: connect ECONNREFUSED ::1:27017
[nodemon] app crashed - waiting for file changes before starting...

• 检查MongoDB服务状态：按Win+R输入services.msc打开服务管理器，找到MongoDB服务，确认它处于“正在运行”状态。若未启动，右键点击启动，可设置为“自动启动”避免重复操作。
• 强制使用IPv4连接：Node.js 18默认优先用IPv6，而MongoDB可能未监听IPv6地址。把连接字符串从mongodb://localhost:27017改成mongodb://127.0.0.1:27017。
• 验证端口占用情况：打开命令提示符，执行netstat -ano | findstr :27017，查看27017端口是否被其他进程占用。若被占用，停止对应进程或修改MongoDB配置文件中的监听端口。
• 检查MongoDB连接配置：打开MongoDB配置文件（通常在C:\Program Files\MongoDB\Server\6.0\bin\mongod.cfg），确认net.bindIp设置为127.0.0.1或0.0.0.0，确保允许本地连接。
• 完善代码错误处理：原代码仅打印ERROR无法定位问题，建议补充详细错误日志，并在操作完成后关闭数据库连接：

  MongoClient.connect("mongodb://127.0.0.1:27017",function(err,client){
    if(err) {
      console.error('数据库连接失败:', err);
      return;
    }
    client.db('mydata').collection('user').insertOne(req.body)
    .then(result => {
      console.log('数据插入成功:', result);
      client.close();
    })
    .catch(err => {
      console.error('数据插入失败:', err);
      client.close();
    })
  })
  

内容的提问来源于stack exchange，提问作者FEBIN DEVASSIA