Express.js req.ip is returning ::ffff:127.0.0.1

Question

I am currently trying to get the IP of the requested user. The problem is the IP is returning ::ffff:127.0.0.1 instead of 127.0.0.1. I tried using

Answer 1

You can Get your Ip address alone or with The specified family using sockets

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

 app.get("/ip", (req, res) => {
        console.log(req.ip) 
       let ip = req.ip.split(':');
        let ip_details = req.socket.address();
          console.log(ip_details);                     
   // { address: '::ffff:127.0.0.1', family: 'IPv6', port: 3001 

           console.log(ip[3]);//127.0.0.1
                            res.json(ip[3]);  
      }

Answer 2

Windows 7 has IPv6 enabled by default. Even though my server listens on IPv4 only, Windows 7 sends the ::ffff: prefix to the IPv4 as part of the transition to IPv6

::ffff:0:0:0/96 — A prefix used for IPv4-translated addresses which are used by the Stateless IP/ICMP Translation (SIIT) protocol.

Transition from IPv4