Reactjs – Mongo DB connection Failing – MERN

I have written below code in server.js to connect with mongo db-

// server.js
const route =require('./routes/yourRoute');
const express = require('express');
const mongoose = require('mongoose');
const cors = require('cors');
const bodyParser = require('body-parser');

const app = express();
const port = process.env.PORT || 5000;

// Middleware
app.use(cors());
app.use(bodyParser.json());

// MongoDB Connection
mongoose.connect('mongodb://0.0.0.0/my-mern-db', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
})
  .then(() => console.log('MongoDB connected'))
  .catch((err) => console.error(err));

// Routes (Create these later)
 app.use('/api/todo', route);

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

I am getting below errors –

Server is running on port 5000
MongooseServerSelectionError: connect ECONNREFUSED 0.0.0.0:27017
    at _handleConnectionErrors (C:Userssagar.dhanorkarsourcereposmernappnode_modulesmongooselibconnection.js:805:11)
    at NativeConnection.openUri (C:Userssagar.dhanorkarsourcereposmernappnode_modulesmongooselibconnection.js:780:11)
    at runNextTicks (node:internal/process/task_queues:60:5)
    at listOnTimeout (node:internal/timers:538:9)
    at process.processTimers (node:internal/timers:512:7) {
  reason: TopologyDescription {
    type: 'Unknown',
    servers: Map(1) { '0.0.0.0:27017' => [ServerDescription] },
    stale: false,
    compatible: true,
    heartbeatFrequencyMS: 10000,
    localThresholdMS: 15,
    setName: null,
    maxElectionId: null,
    maxSetVersion: null,
    commonWireVersion: 0,
    logicalSessionTimeoutMinutes: null
  },
  code: undefined
}