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Decoding url not working properly JS I tried decodeURIComponent

Hi I have a case a URL simillar to this:
https://linkhere?response-content-disposition=inline; filename="placeholder.jpg"; filename*=UTF-8''placeholder.jpg response-content-type=image/jpeg&X-Amz-Algorithm=....sometextcontinueshere
I am trying to decode it like this and I need to take the filename
const decodedUrl = decodeURIComponent("linkhere")
const urlParams = new URLSearchParams(decodedUrl);
const filename = urlParams.get('filename');
console.log(decodedUrl)
But for some reason does not work the decoding properly, do you guys have any idea?

There is nothing built in that is magically going to get the filename since it is not a querystring paramter. The easiest thing you can do it change whatever is building this to have valid querystring parameters so you can parse it.
With what you have, you will need to read the one parameter that has the file name in it. After that you are going to have to parse out the filename from that string.
Basic idea:
var str = `https://linkhere?response-content-disposition=inline; filename="placeholder.jpg"; filename*=UTF-8''placeholder.jpg response-content-type=image/jpeg&X-Amz-Algorithm=....sometextcontinueshere`;
const url = new URL(str);
const parts = url.searchParams.get('response-content-disposition').split(/;\s/);
const fileNameParam = parts.find(x => x.startsWith('filename=')).match(/"([^"]+)"/)[1];
console.log(fileNameParam);

Get JS src params inside of JS file

I've got a JS file called test.js, I'd like to pull in and utilize params that are attached to the extension of this file, but for some reason when I console log the results, I'm not seeing them.
How can I use the URL of a JS file to bring in variables, e.g:
<script src="test.js?var1=value1&var2=value2"></script>
The contents of my JS file is:
const search = window.location.search
console.log(search) <-- not seeing var1 or var2
What am I missing?
P.S: I cannot define a variable outside of the JS file and then use it within, surely there's a way to use the attached vars on the URL?

window.location is the location of the HTML document the script is running inside.
To get the value of the src attribute you need to use document.currentScript to get the element, then you can read its src property (and then you can parse it with URL()).
Unless you are sending the values to the server hosting the JS for server side processing, you'd likely be better off using data attributes instead.
<script data-foo="example">
console.log(document.currentScript.dataset.foo);
</script>

window.location.search returns the query string part of the URL[the current location of the document]. If you want to access the src of the script element, you may assign any unique identifier to the tag and may access the src property.
To access search parameters, you may use new URL(src)
let src = document.getElementById('src').src;
console.log('src - ', src);
const url = new URL(src);
console.log('search params - ', url.search);
<script src="test.js?var1=value1&var2=value2" id="src"></script>

How to use Javascript to get current file name and use as a variable in Pug/HTML template?

I would like to pass the file name to the tag in an html document. I would therefor like to grab it and put it in a variable. I am using Pug, so can use javascript before compiling to html.
This is obviously, obviously not correct code, but is the idea of what I need:
let title tag === filename.pug
I have tried this and it works in the browser, but it works off the url and I would like to do it off the OSX file path.
var filename = (location.pathname.substring(location.pathname.lastIndexOf("/") + 1)).replace('.html','');
document.getElementById("title").innerHTML = filename;

file.value returns undefined

I need to get the path of a file that I select in the JavaScript. What I researched, the file.value parameter should return this path. But it is returning undefined.
How to solve?
Below part of the code:
var fileInput = document.getElementById('fileInput');
var file = fileInput.files[0];
var path = file.value;
document.getElementById("path").value = path; // ---> IT IS SHOWING "undefined"

fileInput.files[0] is a File object. It doesn't have a value property.
See: JavaScript File API
Also, for security reasons you can't get the full path of a file, just the filename.

Javascript: how to append data to a file

how can i append data to a file using javascript?
i tried to use this code, but i got an error:
var fso = new ActiveXObject("Scripting.FileSystemOject");
var filepath = fso.GetFile("member.txt");
var fileObject = fso.OpenTextFile(filepath, 8);
file.WriteLine(id + "|" + pass);
fileObject.close();
the error is on var fso = new ActiveXObject("Scripting.FileSystemOject");, written: Error: Automation server can't create object
is there any other way to append the file using javascript or the way to fix this? thanks :)
EDIT:
i have doing what's written on this, and it still not working :/

I just realized these in your code:
var fileObject = fso.OpenTextFile(filepath, 8,true);
You'll need the true-argument, if the file does not exist, or you want to overwrite/append it.
var filepath = fso.GetFile("member.txt");// This won't work.
var filepath = "your_filePath"; // Use this instead
var fileObject = fso.OpenTextFile(filepath, 8, true);
OpenTextFile() needs a path as a string like "D:/test/file.txt". GetFile() returns an object, which you can see as a string (D:\test\file.txt), but it's not a string. Use also absolute paths, relative paths don't seem to work by my experience.
EDIT
Add the code below to the <head>-part of your html-file, then save locally as a hta (with file extension hta, not htm or html).
<hta:application
applicationName="MyApp"
id="myapp"
singleInstance="yes"
/>
Then run the hta-file. If you still getting an ActiveX-error, it's not supported by your OS. If this works, you haven't done all the security settings correct.
EDIT II
In this case it's not very usefull to get the path through ActiveX, you'll need to write it literal anyway. And I'm not supposed to do your homeworks, but this does the trick...
var filepath = new String(fso.GetFile("member.txt")).replace(/\\/g,'/');
And don't forget what I've said above about using absolute paths...

The 8 in the OpenTextFile function specify that you want to append to the file. Your problem comes from the security restriction of your browser. To make it work you'll have to lower the security level, which is not really recommended.

The error is thrown because there are security restrictions which donot allow the activex to run. change your security settings to allow the activex if your using internet explorer (which i think you are).
This might be useful http://windows.microsoft.com/en-US/windows/help/genuine/ie-activex
Cheers
EDIT: i have doing what's written on this, and it still not working :/
* try Restarting your browser

As pointed out in this comment
Javascript: how to append data to a file
the cause of the error Error: Automation server can't create object is the typo in the progid passed to ActiveXObject: Oject instead of Object:
var fso = new ActiveXObject("Scripting.FileSystemOject");
there is a missing b!