Express.js – req.ip Property

req.ip consists of the remote IP address from where the request is received. The value of this property is taken from the leftmost entry in the x-forwarded-for header when the trust proxy settings are not set to False. The headers are set by the client or proxy.

Syntax

req.ip

Example 1

Create a file with the name "reqIp.js" and copy the following code snippet. After creating the file, use the command "node reqIp.js" to run this code as shown in the example below −

// req.ip Property Demo Example
// Importing the express & cookieParser module
var cookieParser = require('cookie-parser');
var express = require('express');

// Initializing the express and port number
var app = express();

// Initializing the router from express
var router = express.Router();
var PORT = 3000;

// Defining an Endpoint
app.get('/api', function (req, res) {
   console.log("IP : ", req.ip);
   res.send(req.ip);
});
app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Output

Hit the following Endpoint with a GET request: localhost:3000/api

C:\home
ode>> node reqIp.js
Server listening on PORT 3000
IP : ::ffff:127.0.0.1

Example 2

Let's take a look at one more example.

// req.ip Property Demo Example
// Importing the express & cookieParser module
var cookieParser = require('cookie-parser');
var express = require('express');

// Initializing the express and port number
var app = express();

// Initializing the router from express
var router = express.Router();
var PORT = 3000;

// Enabling trust proxy
app.enable('trust proxy')

// Defining an Endpoint
app.get('/api', function (req, res) {
   console.log("IP : ", req.ip);
   res.send(req.ip);
});

app.listen(PORT, function(err){
   if (err) console.log(err);
   console.log("Server listening on PORT", PORT);
});

Output

Hit the following Endpoints one by one −

• GET Request – localhost:3000/api

and set the following header as −

• x-forwarded-header – 103.0.113.165

C:\home
ode>> node reqIp.js
Server listening on PORT 3000
IP : 103.0.113.165