Tree widget to show JSON document

I plan to implement a simple web application which displays network traces similar to wireshark.

Each message should be represented by an expandable item. In the collapsed state the item should display the message type and main message parameters. ex:

+<Msg Type> (Param1, Param2, Param3)
+<Msg Type> (Param1, Param2, Param3)
+<Msg Type> (Param1, Param2, Param3)

When the item is expanded internal structure of the messages is displayed:

-<Msg Type>
  +Some part of the message
  -Other part of the message
    param1
    param2 

The messages are currently stored in JSON document and can be converted to some other format if required.

So, I need a widget that can provide the behavior described above. Please, recommend a library/framework that has such widget.

Thanks in advance for your suggestion.