JavaScript to Read a File data Line by Line 19.04.22

document.getElementById('file').onchange = function(){
  var file = this.files[0];
  var reader = new FileReader();
  reader.onload = function(progressEvent){
    console.log(this.result);
  };
  reader.readAsText(file);
}

only javascript:
let el = document.createElement("input");
    el.setAttribute('type', 'file');
    el.addEventListener("change", load_file);

let evt = new MouseEvent('click', {
    'view': window,
    'bubbles': true,
    'cancelable': true
    });

https://www.delftstack.com/howto/javascript/javascript-read-file-line-by-line/

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JavaScript to Read a File data Line by Line 19.04.22

Information Epoch 1783231700