Pass in a JS object and you can have it downloaded from the browser in plaintext. Based on https://www.aspsnippets.com/Articles/Download-JSON-object-Array-as-File-from-Browser-using-JavaScript.aspx

browser_downloader.js

function DownloadThis(data){
    //Convert JSON Array to string.
    var json = JSON.stringify(data);

    //Convert JSON string to BLOB.
    json = [json];
    var blob1 = new Blob(json, {
      type: "text/plain;charset=utf-8"
    });

    //Check the Browser.
    var isIE = false || !!document.documentMode;
    if (isIE) {
      window.navigator.msSaveBlob(blob1, "download.txt");
    } else {
      var url = window.URL || window.webkitURL;
      link = url.createObjectURL(blob1);
      var a = document.createElement("a");
      a.download = "download.txt";
      a.href = link;
      document.body.appendChild(a);
      a.click();
      document.body.removeChild(a);
    }
}