If you are stuck with Json related stuffs and those too with lots of records in them, then you must know how painful it can be to view and debug though the unstructured Json data And you must be already using some kind of Json formatter to format the Json so that you can view and identify particular Json element with ease. For this I used JSONLint for a long time. This online Json validator will validate the text input to check if it’s really a Json and upon validation will format it so that you can easily understand the Json structure and find the elements that you need. But for larger input of data like more that 1mb or so, sometimes my Firefox browser hangs because of some unresponsive script from JSONLint. But recently I found an better alternative in http://jsonviewer.stack.hu/ . Though it also makes my browser unresponsive sometimes but in lesser rate than JSONLint. Anyways I guess my machine configuration has to do with that processing problem too
You can try both of them. And if you face any problem with JSONLint for bigger Json, just use http://jsonviewer.stack.hu/ . Its script seems to be somewhat better in processing Json input I think.