Custom filename for BLOB URL

I am implementing this functionality in ReactJS, Application generated blob url but I want to replace it with my custom file name. I tried but unfortunately was not able to achieve my goal could someone please help me thanks.

  const blob = new Blob([res.data], { type: 'application/pdf' })
    const blobUrl = URL.createObjectURL(blob)
    var fileLink = document.createElement('a')
    fileLink.href = fileLink

    // it forces the name of the downloaded file
    fileLink.download = 'pdf_name.pdf'

    // triggers the click event
    fileLink.click()

I implemented this code but when it get downloaded it showing Failed - no file