Help needed for parsing JSON

[SofCave]

I have a Discovery rules that returns, for example, A and B.
Then I have a Item prototypes that executes a script with the discovered values, Ex.: script.sh "A".
This script returns the following JSON:

{
    "DATA1": {
        "A": 19,
        "B": 97,
        "C": 100
    },
    "DATA2": {
        "X": 9,
        "Y": 9,
        "Z": 1
    }
}

"DATA1", "DATA2" are fixed keys.
"A", "B", "C" can vary depending on the targeted server?

Now I want to have an item like DATA1[A] = 19

I don't know how to retrieve "A", "B" and "C" and their values.


Thanks for the help