[Api] How to determine a user's IP address in node


var ip = req.headers['x-forwarded-for'] || 
     req.connection.remoteAddress || 
     req.socket.remoteAddress ||
     (req.connection.socket ? req.connection.socket.remoteAddress : null);

Note that sometimes you can get more than one ip address in req.headers['x-forwarded-for'].

The general format of the field is:

x-forwarded-for: client, proxy1, proxy2, proxy3

where the value is a comma+space separated list of IP addresses, the left-most being the original client, and each successive proxy that passed the request adding the IP address where it received the request from. In this example, the request passed through proxy1, proxy2, and then proxy3. proxy3 appears as remote address of the request.

This is the solution suggested by Arnav Gupta:

var ip = req.headers['x-forwarded-for'].split(',').pop() || 
         req.connection.remoteAddress || 
         req.socket.remoteAddress || 

How can I determine the IP address of a given request from within a controller? For example (in express):

app.post('/get/ip/address', function (req, res) {
    // need access to IP address here

There are two ways to get the ip address

  1. let ip = req.ip

  2. let ip = req.connection.remoteAddress; But there is a problem. If you are running your app behind Nginx or any proxy, every single IP addresses will be

So, the best solution to get the ip address of user is:-

let ip = req.header('x-forwarded-for') || req.connection.remoteAddress;

If you're using express version 3.x or greater, you can use the trust proxy setting (http://expressjs.com/api.html#trust.proxy.options.table) and it will walk the chain of addresses in the x-forwarded-for header and put the latest ip in the chain that you've not configured as a trusted proxy into the ip property on the req object.

Simple get remote ip in nodejs:

var ip = req.header('x-forwarded-for') || req.connection.remoteAddress;

Following Function has all the cases covered will help

var ip;
if (req.headers['x-forwarded-for']) {
    ip = req.headers['x-forwarded-for'].split(",")[0];
} else if (req.connection && req.connection.remoteAddress) {
    ip = req.connection.remoteAddress;
} else {
    ip = req.ip;
}console.log("client IP is *********************" + ip);

You can use request-ip, to retrieve a user's ip address. It handles quite a few of the different edge cases, some of which are mentioned in the other answers.

Disclosure: I created this module


npm install request-ip

In your app:

var requestIp = require('request-ip');

// inside middleware handler
var ipMiddleware = function(req, res, next) {
    var clientIp = requestIp.getClientIp(req); // on localhost >

Hope this helps