CODEWITHSUNDEEP
javascriptnode.jsexpress
bharz629
bharz629

Reputation: 161

How to get the server host and port of a started express app in a utility file

I've a need to know the server host name and port on which the express app in another javascript file say under lib. How can I get it?

I tried to do module.exports = app but it didn't work.

Upvotes: 0

Views: 2824

Answers (1)

Zack Harley
Zack Harley

Reputation: 140

When declaring an express app, you can export a listener which will give you the host and address:

/index.js 

var express  = require('express');
var app = express();

app.get('/', function(req, res) {
    res.send('Hello world!\n');
});

var listener = app.listen(process.env.PORT || 3000);

module.exports = listener;

Then you can require that module in your lib files to be able to access the host and port:

/lib/index.js 

var listener = require('./../index.js');
var address = listener.address();
var host = address.address;
var port = address.port;
console.log('Listening on ' + host + ':' + port);
// < - 'Listening on :::3000'

Upvotes: 1

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