Append text to file on server in pure javascript?

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As title.
I am maintaining a web page system, and adding some new features on it. I want to write log to a file on server instead of console.log() because I want to know what happened and when, and I think that it may make me tracing bugs easier. But I searched on Google for several solutions, some uses ActiveXObject and some uses Node.js. And I failed to use ActiveXObject on Edge.
How could I make it?

What I have tried:

JavaScript

function WriteLog(eventdata){
    var fs=new ActiveXObject("Scripting.FileSystemObject");
    var f=fs.OpenTextFile("D:\\log.log",2,true);
    f.Write(eventdata+"\r\n");
}

I executed this function on Edge and get an error says "'ActiveXObject' is not defined".

Posted 14-Feb-19 15:55pm

Momoko Asahina 708H

Updated 14-Feb-19 16:58pm

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Dave Kreskowiak · Accepted Answer · 2019-02-14T16:58:00

You're not going to be able to write to a file on the server from code running in the browser.

ActiveX isn't supported by any current browsers because it was found to be insecure.

You can use an ajax call to a method the web server exposes to tell it to write something to the log. Goggle for "javascript ajax call" for examples. You're also going to have to write a Web Api method to give the browser something to call.