How to run nodejs express snap application

I have nodejs snap application, in which express server is used, 
here is express app.js code

#!/usr/bin/env node

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

// Define a route for the root URL
app.get('/', (req, res) => {
  res.send('Welcome to our Node.js Express app !');
});

// Define a route to get a list of items
app.get('/items', (req, res) => {
  const items = ['Item 1', 'Item 2', 'Item 3'];
  res.json(items);
});

// Start the server
app.listen(port, () => {
  console.log(`Server is running on http://localhost:${port}`);
});\
 
now i install snap application on vm ctrlx works in service mode, how i can run the project and how i can 

http://localhost:3000 

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