Just wanted to share with you my new library which lets you process huge JSON objects (e.g. 1MB or more) on devices with little memory such as the ESP8266. It is an event driven stream parser and is especially helpful if you are not interested in the whole JSON object but only in a portion of it. I published it under the MIT license and you can find it on Github.
Read more here: http://blog.squix.ch/2015/10/esp8266arduino-processing-huge-json.html
Hope it will be as helpful to you as it is to me...
Cheers,
Dani