Decode body response created by https://github.com/flickr/yakbak

decode_yakbak.js

var zlib = require('zlib');
var gunzip = zlib.createGunzip();
var buf1 = new Buffer("...", "base64")
var buf2 = new Buffer("...", "base64")
var buf3 = new Buffer("...", "base64")
var buf = Buffer.concat([buf1, buf2, buf3])
zlib.gunzip(buf, function(err, dezipped) {
  console.log(dezipped.toString())
});