async function getTextFromFileUrlAsync(url) { return new Promise(function (resolve, reject) { var req = new XMLHttpRequest(); req.open("GET",url, true); req.setRequestHeader("Cache-Control", "max-age=0") req.onreadystatechange = function() { if (req.readyState == 4) { if (req.status == 200 || req.status==304) {//when a good response is given do this var text = req.responseText; resolve(text); } else { reject({ status: req.status, statusText: req.statusText }); } } } req.send(); }); } async function getTextFromUploadedFileAsync(inputFile){ const temporaryFileReader = new FileReader(); return new Promise((resolve, reject) => { temporaryFileReader.onerror = () => { temporaryFileReader.abort(); reject(new DOMException("Problem parsing input file.")); }; temporaryFileReader.onload = () => { resolve(temporaryFileReader.result); }; temporaryFileReader.readAsText(inputFile); }); };