How to create a CDN for an application running on localhost/Ip address without a domain (.com)

To improve the performance of the application , I want to host my static assets on CDN. But we have not yet created a domain using nginx. How to still use a cdn like - express-simple-cdn link -

https://www.keycdn.com/support/express-cdn-integration

i need to write this domainName.com in my app.js file of Angular app through which i host my application--

// Initialize Express in a variable in app.js
var app = express();

// Define Your CDN base path
var CDN = "https://assets.preisheld.ch";
// Register a local variable in your app which contains the CDN function
app.locals.CDN = function(path, type, classes, alt) {
    if(type == 'js') {
        return "<script src='"+CDN+path+"' type='text/javascript'></script>";
    } else if (type == 'css') {
        return "<link rel='stylesheet' type='text/css' href='"+CDN+path+"'/>";
    } else if (type == 'img') {
        return "<img class='"+classes+"' src='"+CDN+path+"' alt='"+alt+"' />";
    } else {
        return "";
    }
};

How to utilize CDN in such a situation ?

Solution

So is there a dummy a place where you can create your domainName.com address for free while opening it in your local ip address

Yes! That's the hosts file. You can find it on your system here:

Windows: C:\Windows\System32\Drivers\etc\hosts
Linux: /etc/hosts
OS X: /private/etc/hosts

This file allows you to map arbitrary host names to network addresses, overriding anything that comes from DNS. For example:

127.0.0.1 yourproject.test

Now, if you go to http://yourproject.test in your browser, it will resolve to 127.0.0.1 and connect the web server running on your loopback address. If you're using IPv6, use ::1 instead of 127.0.0.1.

You can set any hostnames you want... even real ones that exist. However, it is strongly recommended that you use the .test top-level domain, as it's specifically reserved for testing purposes.