BlobSaving.js

BlobSaving.js

var saveData = (function () {
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style = "display: none";
    return function (data, fileName) {
        var json = JSON.stringify(data),
            blob = new Blob([json], {type: "octet/stream"}),
            url = window.URL.createObjectURL(blob);
        a.href = url;
        a.download = fileName;
        a.click();
        window.URL.revokeObjectURL(url);
    };
}());

var data = { x: 42, s: "hello, world", d: new Date() },
    fileName = "my-download.json";

saveData(data, fileName);

// OR

// https://stackoverflow.com/a/48374078
blobGeneratingFunction.then(blob => {
  let a = document.createElement("a") 
  let blobURL = URL.createObjectURL(blob)
  a.download = 'test.png'
  a.href = blobURL
  document.body.appendChild(a)
  a.click()
  document.body.removeChild(a)
})