Express.js- Why is Localhost '::'

Question

Can anyone tell me why my server address (host) is :: and not localhost

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

// respond with "hello world" when a GET request is made to the homepage
app.get('/', function(req, res) {
  res.send('hello world');
});

var server = app.listen(3000, function () {
  var host = server.address().address;
  var port = server.address().port;
  console.log('Example app listening at http://%s:%s', host, port);
});

This returns

Example app listening at http://:::3000

It works fine when I go to http://localhost:3000/

score 5 · Accepted Answer · answered Jul 25 '15 at 16:11

5

Because :: is localhost when using IPv6, just like it is 127.0.0.1 in IPv4.

answered Jul 25 '15 at 16:11

idstam

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Ah ha. Is IPv6 the standard in Express then? Is there any way to toggle between the two? – Davetherave2010 Jul 25 '15 at 16:32
http://stackoverflow.com/questions/29411551/express-js-req-ip-is-returning-ffff127-0-0-1 – idstam Jul 26 '15 at 10:06

Express.js- Why is Localhost '::'

1 Answers1