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

I ran into the same issue today and the port was not used. The following approach helped:

rm -rf node_modules && npm cache clean && npm install
npm start

Answer 2

->check what’s running on port 8080 or what ever port u want to check

lsof -i @localhost:8080

if something is running u can close it or use some kill command to close it

Answer 3

This worked for me.

http://www.codingdefined.com/2015/09/how-to-solve-nodejs-error-listen.html

Just change the port number from the Project properties.

Answer 4

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, {});

Answer 5

Close any other node servers that are running, even if they are in other terminal windows or running on different ports. That should fix the problem.

Answer 6

events.js:183 throw er; // Unhandled 'error' event

I also got the same kind of problem and tried many ways but finally got this, this works well:

npm install ws@3.3.2 --save-dev --save-exact

Refer to this link for more clarifications https://github.com/ionic-team/ionic-cli/issues/2922