i do something wrong, but i cannot see it…
i have a valid JSON (although the validator says so 🙂 ):

{
    "battery.level": 60,
    "channel.id": 1213793,
    "ident": "xx",
    "message.type": "V1",
    "peer": "xx",
    "position.direction": 0,
    "position.latitude": 1.3xx,
    "position.longitude": 1.3xx,
    "position.speed": 25
}

If i try to read the value of this object with the following piece of code in a function node

enter image description here

i get the following error:

enter image description here

What do i do wrong?

see above
code should be good..