{
    "guid": "5c1bd2ae4f8b44d9bc100ef3eaceb425",
    "fileType": "txt",
    "filename": "tere.txt",
    "file": "SGVsbG8hClRoaXMgaXMgYW5vdGhlciBsaW5lLg=="
}

retrieveFile: async (req, res) => {

     // codigo

      let data = response.data.data.file;
      let buff = Buffer.from(data, 'base64');
      res.download(fs.writeFileSync('stack-abuse-logo-out.png', buff));

     // codigo
}