ExpressJS - throw er Unhandled error event

Question

I created expressjs application using the following commands:

express -e folderName
npm install ejs --save
npm install

When I run the appli

Answer 1

After killing the same process multiple times and not being able to locate what else was running on port 8000, I realized I was trying to run on port 8000 twice:

Before:

MongoClient.connect(db.url, (err, database) => {
  if (err) return console.log(err);
  require('./app/routes')(app, database);

  app.listen(port, () => {
    console.log('We are live on ' + port);
  });
});

require('./app/routes')(app, {});
app.listen(port, () => {
  console.log("We are live on " + port);
});

After:

MongoClient.connect(db.url, (err, database) => {
  if (err) return console.log(err);
  require('./app/routes')(app, database);

  app.listen(port, () => {
    console.log('We are live on ' + port);
  });
});

require('./app/routes')(app, {});