Using this answer, with mkdirp, I want to create a directory and save files inside. Inside of plates those folders will be created and reuse if present.

const fs = require('fs')

const mkdirp = require('mkdirp')



// Decode image then save to local storage

const decodeBase64Image = (string, plateNumber) => {

  let regex = /^data:.+/(.+);base64,(.*)$/

  let matches = string.match(regex)

  let ext = matches[1]

  let data = matches[2]

  let buffer = new Buffer(data, 'base64') // I cant use Buffer.alloc()



  let pathForImages = `plates/${plateNumber}`



  saveImagesToPath(pathForImages, ext, buffer)

}





const saveImagesToPath = (pathForImages, ext, buffer) => {

  mkdirp(pathForImages, function (err) {



    fs.writeFileSync(pathForImages, 'data.' + ext, buffer) 



  })

}



let string = data:image/gif;base64,R0lGODlhPQBEAPeoAJosM//AwO/AwHVYZ/<SHORTEN>w==



// Performing it all

decodeBase64Image(string, 'HGT5KU')

Error message:

fs.js:651

  return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);

                 ^



Error: EISDIR: illegal operation on a directory, open 'plates/HGT5KU'

Basically, create a sub-folder for plates with the name of the plate numbers and save data inside that folder: plates/HGT5KU/foo.png others: plates/GFTYU7/bar.jpg