How to redirect any subdirectory to parent directory index without .htaccess?

Now I am redirecting any subdirectory to the index.html of the parent directory with a .htaccess “RewriteRule”

RewriteEngine On
RewriteRule ^(.*)$ index-dev.html 

https://myserver.com/parent/* to https://myserver.com/parent

Is there any way to do it without .htaccess? For example with JS? Thank you

Answer

OK, I see maybe is not possible.

I am going to use the JS URLSearchParams functions to get a variable value

  var queryString = window.location.search;
  var urlParams   = new URLSearchParams(queryString);

  var myDIrectory     = urlParams.get('directory');
  ...