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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
Updated on: 06-Apr-2022
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