express static server template

server.js

var express = require('express');
var app = express();
var port = process.env.PORT || 3000;


app.use(express.static('./buildfolder'));

app.listen(port, function() {
  console.log('Server started and listening to::'+port);
});

Development/feeesbooeek/src
Development/feeeeboeek4heroku/server.js
Development/feeeeboeek4heroku/buildfolder

npm run build

package.json

   { 
"scripts": {
"start": "node server.js"
   }
}