Download Any File from Blob

function downloadBlob(blob, name = 'file.txt') {
    if (
      window.navigator && 
      window.navigator.msSaveOrOpenBlob
    ) return window.navigator.msSaveOrOpenBlob(blob);

    // For other browsers:
    // Create a link pointing to the ObjectURL containing the blob.
    const data = window.URL.createObjectURL(blob);

    const link = document.createElement('a');
    link.href = data;
    link.download = name;

    // this is necessary as link.click() does not work on the latest firefox
    link.dispatchEvent(
      new MouseEvent('click', { 
        bubbles: true, 
        cancelable: true, 
        view: window 
      })
    );

    setTimeout(() => {
      // For Firefox it is necessary to delay revoking the ObjectURL
      window.URL.revokeObjectURL(data);
      link.remove();
    }, 100);
}

// Usage
downloadBlob(blob, 'myfile.pdf');

function downloadBlob(blob, name = 'file.txt') {
  // Convert your blob into a Blob URL (a special url that points to an object in the browser's memory)
  const blobUrl = URL.createObjectURL(blob);

  // Create a link element
  const link = document.createElement("a");

  // Set link's href to point to the Blob URL
  link.href = blobUrl;
  link.download = name;

  // Append link to the body
  document.body.appendChild(link);

  // Dispatch click event on the link
  // This is necessary as link.click() does not work on the latest firefox
  link.dispatchEvent(
    new MouseEvent('click', { 
      bubbles: true, 
      cancelable: true, 
      view: window 
    })
  );

  // Remove link from body
  document.body.removeChild(link);
}

// Usage
let jsonBlob = new Blob(['{"name": "test"}'])
downloadBlob(jsonBlob, 'myfile.json');