Node.js/Express.js App Only Works on Port 3000

Question

I have a Node.js/Express.js app running on my server that only works on port 3000 and I\'m trying to figure out why. Here\'s what I\'ve found:

• Without specifyi

Answer 1

I am using the minimist package and the node startup arguments to control the port.

node server.js --port 4000

or

node server.js -p 4000

Inside server.js, the port can be determined by

var argv = parseArgs(process.argv.slice(2))

const port = argv.port || argv.p || 3000;
console.log(`Listening on port ${port}...`)

//....listen(port);

and it defaults to 3000 if no port is passed as an argument.

You can then use listen on the port variable.