How to include own directory to read text file

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Javascript

Hi, so I want to be able to read a text file called Language.txt, it is already included within my code folders. I have been trying to search for a code that is not node.js and does not include an input type file to read from the text file.

here is the javascript i got so far the input parameter is from an input type file just to test it out which works but now i don't want to use the input and just directly from Language.txt:

function readFile(input) {
    alert(input);
    let file = input.files[0];  
    let reader = new FileReader();  
    reader.readAsText();
  
    reader.onload = function() {
      console.log(reader.result);
    };
  
    reader.onerror = function() {
      console.log(reader.error);
    };  
}

What I have tried:

it only works when i use an input type file. I was just wondering how to tweak the code to just directly read from Language.txt directly