var zlib = require('zlib');

var plaintext = 'Hello World';
var compressedData = [];

var compressor = zlib.createGzip();
compressor.write(plaintext);
compressor.end();

compressor.on('data', function(d) { compressedData.push(d);});
compressor.on('end', function() {
  var b64CompressedData = new Buffer(compressedData.join('')).toString('base64');
  var b64CompressedBuf = new Buffer(b64CompressedData, 'base64');

  var decompressedData = [];
  var decompressor = zlib.createGunzip();
  decompressor.write(b64CompressedBuf);
  decompressor.end();
  decompressor.on('data', function(d) { decompressedData.push(d); });
  decompressor.on('error', function(e) { console.error('error: ' + e); });
  decompressor.on('end', function() {
    console.log(decompressedData.join(''));
  });
});