node 將base64 圖片轉成 Buffer 保存

  const dataMiniURLBase64 = reqData.miniURL.replace(/^data:image\/\w+;base64,/, '')
  const dataMiniBuffer = Buffer.from(dataMiniURLBase64, 'base64') //把base64碼轉成buffer對象，
  const fileName = 'filename'
      fs.writeFile(fileName, dataMiniBuffer, error => {
        if (error) {
          console.log(error)
          return res.send({
            code: 500,
            error,
          })
        }

        res.send({
          code: 200,
          msg: '保存成功！'
        })
      })