get ip user with nginx and node

proxy_set_header X-Real-IP $remote_addr; Did not worked for me

When running an Express app behind a proxy, you have to set the application variable trust proxy to true. Express offers a few other trust proxy values which you can review in their documentation, but for now, we don’t have to mind them.

Without further ado, these are the steps to reveal a visitor’s IP address to your app:

1. app.set('trust proxy', true) in your Express app.
2. Add proxy_set_header X-Forwarded-For $remote_addr in the Nginx configuration for your server block.
3. You can now read off the client’s IP address from the req.header('x-forwarded-for') or req.connection.remoteAddress;

like below in Nginx config

location /  {
            proxy_pass    http://localhost:3001;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_set_header X-Forwarded-For $remote_addr;  # this line
            proxy_cache_bypass $http_upgrade; 
    }

You can configure NGINX to pass the client's IP address with the following setting:

location / {
        proxy_pass https://fotogena.co:8000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;  # This line.
        proxy_connect_timeout   1000;
        proxy_send_timeout      1500;
        proxy_read_timeout      2000;
}

You can then use the HTTP header X-Real-IP from req.headers["x-real-ip"].