Mongodb – Connect ECONNREFUSED ::1:27017

Hi I have been trying to figure this error out for two whole days, googling, reading relevant forums in here, but seems I can not solve this error to make my code to fully function. I would appreciate any help

the first bit stands for the description of the error and the later bits are the codes . Again thank you in advance.

[nodemon] restarting due to changes...
[nodemon] starting `node app.js`
C:Users류 광섭Desktop0-starting-projectnode_modulesmongodblibsdamtopology.js:291
                const timeoutError = new error_1.MongoServerSelectionError(`Server selection timed out after ${serverSelectionTimeoutMS} ms`, this.description);
                                     ^

MongoServerSelectionError: connect ECONNREFUSED ::1:27017
    at Timeout._onTimeout (C:Users류 광섭Desktop0-starting-projectnode_modulesmongodblibsdamtopology.js:291:38)
    at listOnTimeout (node:internal/timers:564:17)
    at process.processTimers (node:internal/timers:507:7) {
  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: 50395518,
        lastWriteDate: 0,
        error: MongoNetworkError: connect ECONNREFUSED ::1:27017
            at connectionFailureError (C:Users류 광섭Desktop0-starting-projectnode_modulesmongodblibcmapconnect.js:387:20)
            at Socket.<anonymous> (C:Users류 광섭Desktop0-starting-projectnode_modulesmongodblibcmapconnect.js:310:22)
            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
              at TCPConnectWrap.afterConnect [as oncomplete] (node:net:1247:16) {
            errno: -4078,
            code: 'ECONNREFUSED',
            syscall: 'connect',
            address: '::1',
            port: 27017
          },
          [Symbol(errorLabels)]: Set(1) { 'ResetPool' }
        },
        topologyVersion: null,
        setName: null,
        setVersion: null,
        electionId: null,
        logicalSessionTimeoutMinutes: null,
        primary: null,
        me: null,
        '$clusterTime': null
      }
    },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    setName: null,
    maxElectionId: null,
    maxSetVersion: null,
    commonWireVersion: 0,
    logicalSessionTimeoutMinutes: null
  },
  code: undefined,
  [Symbol(errorLabels)]: Set(0) {}
}

app.js

const path = require('path');

const express = require('express');

const blogRoutes = require('./routes/blog');

const app = express();

const db = require("./data/database");

// Activate EJS view engine

app.set('view engine', 'ejs');

app.set('views', path.join(__dirname, 'views'));

app.use(express.urlencoded({ extended: true })); // Parse incoming request bodies

app.use(express.static('public')); // Serve static files (e.g. CSS files)

app.use(blogRoutes);

app.use(function (error, req, res, next) {

  // Default error handling function

  // Will become active whenever any route / middleware crashes

  console.log(error);

  res.status(500).render('500');

});

db.connectToDatabase().then(function () {

  app.listen(3000);

});

database

const mongodb = require("mongodb");

    const MongoClient = mongodb.MongoClient;

    let database;

    async function connect() {

       const client = await MongoClient.connect("mongodb://localhost:27017");

       database = client.db("blog");

    }

    function getDb() {

        if (!database) {

            throw { message: "Database connection not establisehd!" };

        }

        return database;