how to redefine a obfucated javascript function

Question

I want to code a script that redefine an existing obfuscated javascript function.

This is the function that I copied from my website.

userAgentKey: function(e) {
            return this.options.excludeUserAgent || e.push({
                key: "user_agent",
                value: this.getUserAgent()
            }), e
        },

this function return the user agent of my browser(for fingerprinting).

I want to manipulate the return value and want that this function return "exampleBrowserUserAgent". I don't have any experience in OOP.

My problem is that this doesn't redefine my code..

function userAgentKey(){
return "exampleBrowserUserAgent"
}

how can I manipulate the return value?

thanks for your help!

EDIT: the website use the fingerprintjs2.here is the link: enter link description here

Answer 1

Wouldn't it be easier to just modify the userAgent of your browser?

Object.defineProperty(navigator, "userAgent", {value: "exampleBrowserUserAgent"});

Of course you can also directly modify the method, given that your script has access to the scope that the method is in, and the method is loaded but not yet executed:

SomeObject.userAgentKey = myUserAgentKeyFunc;

If you are trying to change the userAgent because you don't want someone else to know which browser you are using, you are better off just changing it right in the Developer Tools or create an extension that modifies it for you.