NodeJS: Save base64 image to disk

base64.js

// Save base64 image to disk
try {
  // Decoding base-64 image
  // Source: http://stackoverflow.com/questions/20267939/nodejs-write-base64-image-file
  function decodeBase64Image(dataString) {
    var matches = dataString.match(/^data:([A-Za-z-+\/]+);base64,(.+)$/);
    var response = {};

    if (matches.length !== 3) {
      return new Error('Invalid input string');
    }

    response.type = matches[1];
    response.data = new Buffer(matches[2], 'base64');

    return response;
  }

  // Regular expression for image type:
  // This regular image extracts the "jpeg" from "image/jpeg"
  var imageTypeRegularExpression = /\/(.*?)$/;

  // Generate random string
  var crypto = require('crypto');
  var seed = crypto.randomBytes(20);
  var uniqueSHA1String = crypto.createHash('sha1').update(seed).digest('hex');

  var base64Data = 'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAZABkAAD/4Q3zaHR0cDovL25zLmFkb2JlLmN...';

  var imageBuffer = decodeBase64Image(base64Data);
  var userUploadedFeedMessagesLocation = '../img/upload/feed/';

  var uniqueRandomImageName = 'image-' + uniqueSHA1String;
  // This variable is actually an array which has 5 values,
  // The [1] value is the real image extension
  var imageTypeDetected = imageBuffer.type.match(imageTypeRegularExpression);

  var userUploadedImagePath = userUploadedFeedMessagesLocation + uniqueRandomImageName + '.' + imageTypeDetected[1];

  // Save decoded binary image to disk
  try {
    require('fs').writeFile(userUploadedImagePath, imageBuffer.data,
    function() {
      console.log('DEBUG - feed:message: Saved to disk image attached by user:', userUploadedImagePath);
    });
  } catch(error) {
    console.log('ERROR:', error);
  }

} catch(error) {
  console.log('ERROR:', error);
}