Why Is My Node Event Callback Showing Up In The Event As Undefined?

I am trying to pass back a url string as 'data' into my eventhandler. My request to the server is 'https://172.20.10.6/index.html'. The console.log below prints out '/index.html'

Solution 1:

It looks like you're swallowing errors.

if(err, data) {
    console.log('error geting data');
}

That condition (err, data) will ignore the value of err. If data is undefined, it will be falsy and you won't know that you had an error. You probably want something more like this:

if (err) {
    console.log('error getting data')
}

Tracing back to your emitter, you are emitting in a way that sends your data to the first argument, which should be where the error goes. So this:

ee.emit("dataIn", req.url);

...should be more like this:

ee.emit("dataIn", null, req.url);