const express = require('express')
    const app = express()
    const port = 3000

    app.get('/', (req, res) => {
    var ip = req.ip
    console.log(ip);
    res.send('Hello World!')
    })

   // Run as nodejs ip.js
    app.listen(port, () => {
    console.log(`Example app listening at http://localhost:${port}`)
    })

在nodejs中简单获取远程ip:

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

在节点10.14中，在nginx后面，你可以通过nginx头请求它来检索ip，就像这样:

proxy_set_header X-Real-IP $remote_addr;

然后在你的app.js中:

app.set('trust proxy', true);

在那之后，你想让它出现的地方:

var userIp = req.header('X-Real-IP') || req.connection.remoteAddress;

我们可以在node js中检查这段代码

const os       = require('os');
const interfaces = os.networkInterfaces();

let addresses = [];

for (var k in interfaces) {

    for (var k2 in interfaces[k]) {

        const address = interfaces[k][k2];

        if ( (address.family === 'IPv4' || address.family === 'IPv6')  && 
            !address.internal) {

            addresses.push(address.address);

        }
    }
}
console.log(addresses);

获取ip地址有两种方式:

让IP = req.ip 让ip = req.connection.remoteAddress;

但上述方法存在一个问题。

如果你在Nginx或任何代理程序后面运行你的应用程序，每个IP地址将是127.0.0.1。

因此，获取user的ip地址的最佳方案是:-

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

你可以像这样快速获取用户Ip

req.ip

在这个例子中，我们获取了用户的Ip，然后用req.ip把它发回给用户

app.get('/', (req, res)=> { 
    res.send({ ip : req.ip})
    
})