const os = require("os");

const ifaces = os.networkInterfaces();
const wlan0Address = ifaces.wlan0[0].address;

let config = {
    address: wlan0Address, // The first IP address of the wlan0 network interface
    port: 8080, 
    // etc...
};

If I write the code as above, I don’t know why, but when I open the server, I don’t see any module screen on the web server. So I thought the modules were a problem, so I modified the code as follows, and the modules come out well from the web server at that address.

/*const os = require("os");
const ifaces = os.networkInterfaces();
const wlan0Address = ifaces.wlan0[0].address;
*/
let config = {
    address: "xxx.xxx.xxx.xxx", // static address
    port: 8080, 
    // etc...
};

The conclusion that I came up with through this process is

const os = require("os");
const ifaces = os.networkInterfaces();
const wlan0Address = ifaces.wlan0[0].address;

I think the code in the above part is problematic, I want to know exactly what the problem is with this code, and how to fix the code to solve it.

In addition, since English is not the main language, I hope you understand that my writing may have some grammatical errors.