Convert PNG image to data URI using Node.js

prettify-base64.js

var fs = require('fs');
//
// reference for accessing file system using node.js
// http://www.sitepoint.com/accessing-the-file-system-in-node-js/
fs.readFile('image.png', 'binary', function(error, data) {
  var buf = new Buffer(data, 'binary');
  var string = buf.toString('base64');
  var limit = parseInt(string.length/50);
  console.log('Data url of the image.png in not more than 50 characters per line:');
  console.log('');
  // first line of output
  console.log('"data:image/png;base64," +');
  for (var i = 1; i <= limit; i++) {
    // more output
    console.log('"' + string.substring( (i - 1) * 50, i * 50 ) + '" +');
  }
  // if there's more base64 to the output
  if (string.length > limit * 50) {
    // final lines of output
    console.log('"' + string.substring( limit * 50, string.length ) + '"');
  }
  console.log('');
});