JSON.download.js

funtion download (obj) {
  const a = document.createElement('a')
  document.body.appendChild(a)
  a.style = 'display: none'

  const str = JSON.stringify(obj, null, 4)
  const blob = new window.Blob([str], {type: 'application/json'})
  const url = window.URL.createObjectURL(blob)
  a.href = url
  a.download = 'obj.json'
  
  a.click()
  window.URL.revokeObjectURL(url)
}