Express is capable of running on dual ports simultaneously, irrespective of the specified port

When launching my express app, I typically use app.listen(PORTNO).

The app usually runs on 127.0.0.1:PORTNO, but oddly enough it also seems to run on 127.0.0.1:3000.

As far as I know, 3000 is the default port for express applications.

Does anyone understand why this unexpected behavior is happening?

I've attempted changing the environment variable to production and even tried using 

http.createServer(app).listen(PORTNO);

My express app files are generated through express-generator.

In case it matters, I'm working on a Windows machine.

UPDATE: I start the server with npm start which executes bin\www, setting the port for running the server. However, this still doesn't clarify why the app seems to bind to two different ports - one specified in app.js and the other in bin\www - making the app accessible on both of them.

Can someone shed some light on this mystery?

javascriptexpressserver

Answer №1

For optimal performance, consider launching your server by using the command node server.js(filename) instead of npm start. This will prevent default configurations from being applied. Keep in mind that npm is primarily used for installing node modules, rather than executing the server.

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