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How to get absolute path of a javascript?

I'm trying to find the absolute path of my javascript file (not the URL). Instead of hardcoding absolutely paths, I'd prefer using relative paths. For example:
/static/js/index.js
/static/config/1.json
/static/config/2.json
If I can get the absolute path of index.js, then I'm only ../config/ away from accessing either of the two json files.
Searching SO and the internet I either get suggestions for finding the URL, which work but won't solve my problem. Or for file paths, using windows.location.pathname but any permutation of it that I try either returns an empty string, or /.
var currentDirectory = window.location.pathname.split('/').slice(0, -1).join('/');
console.log("Curr dir: " + currentDirectory);
(Returns empty string)
var location = window.location.pathname;
var directoryPath = location.substring(0, location.lastIndexOf("/")+1);
console.log(" dirPath: " + directoryPath);
(Returns a /)
What I'm hoping for is something like:
var absolute_path = window.function.absolute.path()
Which would return say: /u/user/develop/project/server/static/js/index.js
From which I could: (pseudo code again)
var locations = absolute_path.split("js");
# location[0] = "/u/user/develop/project/server/static"
# location[1] = "js/index.js"
var config_file_locations = locations[0] + "config/";
var absolute_path_json1 = config_file_locations + "1.json"
-- EDIT --
Ok, looking at window.location it returns the URL so clearly that's not an answer here.

/static/js/index.js is an absolute path. You can tell because it starts with a /, which takes it back to the root of the web site.
There is no automatic way for a browser to tell anything about how a web server determined how it generated the content for a given URL.
All a browser knows is that it asked the server for /static/js/index.js and the server responded with some JavaScript.
The server might have read a static file, and that file might be in a directory called js and that directory might be a subdirectory of one called static … but then the server might have taken the whole URL, used it in a database query, and pulled the results from a database … or it might have proxied the request to another HTTP server on another computer on another continent.
If you want your client-side JS to know anything about the structure of the filesystem on the HTTP server, then you need to give it that information somehow. It can't get it from the browser.

Postman - Get only endpoint from a URL

Having this kind of endpoing:
https://hey.com/p1/m/p2
I want to get rid of the https://hey.com and get only the /p1/m/p2 part on the Pre-request Script. I know I can do it using request.url.replace(/^.*\/\/[^\/]+/, ''), getting the desired output /p1/m/p2.
Is there any other way to do it without using replace or regex? Something like request.url.pathname (which is not working, obviously).
The URL above is just an example, the endpoints and urls will vary.
Bear in mind that I'm using the Pre-request Script on the Postman environment and some things may not work.
Thank you so much.

You should be able to use the URL browser API to construct a URL object.
(new URL(request.url)).pathname
If you're using the desktop version, you can use the built-in node.js API.
var URL = require('url');
URL.parse(request.url).pathname

You can try something like this
var fullUrl = request.url.split('/');
fullUrl.splice(0,3);
var url = a.join('/');
console.log(url);

How would I find a html files parent directory name?

I need to know a html files parent directory so I can access a file in it named the same as the directory. I just need the directory name as a string.

You can try something like
window.location.pathname
But again depends on what you are trying to achieve, show some code.

Background
As #NewUser says, use window.location.pathname if you want only the path. Example: on this page, that gives:
/questions/25717173/how-would-i-find-a-html-files-parent-directory-name
You indicated that you are dealing with an HTML file, though, which implies a file name and file ending (.htm, .html, etc.). So, to get the full URL, minus the file name, you can try using .replace(/[^\/]+$/, ''), like this:
var url = 'http://www.example.com/foo/bar/baz.htm';
alert(url.replace(/[^\/]+$/, ''));
// gives http://www.example.com/foo/bar/
Putting It All Together
To do it without hard-coding the URL:
var path = window.location.toString().replace(/[^\/]+$/, '');
alert(path);

Window location one level up

This is my scenario:
I have my web page in folder:
http://www.example.com/example/index.html
I have media files in folder (one level up):
http://www.example.com/media/
and this files are linked in index.html like so: '../song1.mp3'
So when I read window.location.href from my web page I get this:
http://www.example.com/example/
But my media files are in location http://www.example.com/media/
Now I want to construct a download path for this media, but if I join window.location.href and media url I get this:
http://www.example.com/example/../song1.mp3
and I need to get this:
http://www.example.com/media/song1.mp3
what is the easiest way to manage this?
I am using javascript.

How about this:
var filename = "../song1.mp3",
domain = "http://example.com/", // may be static or made by some black magic
url = domain + "media/" + filename.split("/").pop();
So you just split your path with the ../-part, get the last element (would be "song1.mp3") and put it together to http://example.com/media/song1.mp3
Here your have a live example.

To get path name with url values in jquery

This is an example URL.
http://stackoverflow.com/questions/ask?a=1&b=2
question: I need to fetch path name along with url values like this/questions/ask?a=1&b=2
I need jquery or javascript solution

var url = document.createElement('a');
url.href = 'http://stackoverflow.com/questions/ask?a=1&b=2';
alert(url.pathname + url.search);
Demo: http://jsfiddle.net/karim79/8XYYj/