JavaScript - create CSV

index.js

const $link = document.createElement('a')
const csvName = 'index.csv'

let csv = ''
for(let i = 0; 10000 > i; i++) {
  csv += 'a,b,c,d,e\n'
}

const blob = new Blob([csv], { type: 'text/csv' })

if (window.navigator.msSaveOrOpenBlob) {
  // for ie
  window.navigator.msSaveOrOpenBlob(blob, csvName)
} else if (window.URL && window.URL.createObjectURL) {
  $link.href = window.URL.createObjectURL(blob)
  $link.download = csvName
  $link.style.display = 'none'
  document.body.appendChild($link)
  $link.click()
  window.URL.revokeObjectURL($link.href)
  document.body.removeChild($link)
}