Basic express + Gun setup

GundbSampleServer--server.js

const path = require('path');
const express = require('express');

const Gun = require('gun');
require('gun/nts')

const port = (process.env.PORT || 8080);

const app = express();
app.use(Gun.serve);

const server = app.listen(port);

var gun = Gun({
  web: server,
  localStorage: false,
  radisk: false //will not save anything to disk on the server
});
global.Gun = Gun; /// make global to `node --inspect` - debug only
global.gun = gun; 

setInterval(peers,5000)
function peers(){//this is if you want to know how many peers are connected to your server.
  console.log('Peers: '+ Object.keys(gun._.opt.peers).join(', '))
}


const INDEX_HTML = path.join(__dirname,'public/index.html')
if (process.env.NODE_ENV !== 'production') {//you will have to figure out how this works for your app.
  app.use(express.static('public'));
  app.get('*', function (_, res) {
    res.sendFile(INDEX_HTML);
  });
}else{
  const indexPath = path.join(__dirname, 'dist/index.html');
  app.use(express.static('dist'));
  app.get('*', function (_, res) {
    res.sendFile(indexPath);
  });
}

package.json

"scripts": {
    "server": "node server.js",
    "start": "npm run server"
  },
  "dependencies": {
    "express": "^4.16.4",
    "gun": "^0.2019.612",
  }