Today, I found tow tools for josn. First, open in firefox and editor for jons online and also offline. We can open *.json file in firefox with [JSONView](https://addons.mozilla.org/en-US/firefox/addon/10869/) firefox addon. You will see with syntax highlighting and we can open/close the tree. I found JSONEditor in [here](http://www.thomasfrank.se/json_editor.html). You can use [online](http://www.thomasfrank.se/downloadableJS/JSONeditor_example.html) and [download](http://www.thomasfrank.se/downloadableJS/JSONeditor.zip) for offline.