Unable to extract Json data

var MAC = json["Wi-Fi"][0].mac;

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Hi, '0' is undefined

could you post it ?
if needed use : JSON.stringify(json) in the console and copy past the string you get

or simply type "msg" and paste the string you get

I don't understand line 2

var json = JSON.parse(obj);

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obj is set by accessing the property payload on msg - which indicates msg is already an object - so why parse it again.

Then you are missing a networkInterfaces property in your tree

var MAC = json.["networkInterfaces"]["Wi-Fi"1].mac;

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OR

var MAC = json.networkInterfaces["Wi-Fi"1].mac;

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@Julian you have an extra dot here :
var MAC = json.["ne

@Leakim, thanks - copy and paste hangover from the line below
Corrected

var MAC = json["networkInterfaces"]["Wi-Fi"1].mac;

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var obj = msg.payload;
var json = JSON.parse(obj);


var MAC = json["networkInterfaces"]["Wi-Fi"].mac;

msg.payload = MAC;
return msg;

RESULTS : msg.payload:undefined

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Hi Experts,
The payload: object in this format: -
           -> networkInterfaces
                      ->Wi-Fi
                                ->0: object
                                          ->mac:"7c:8b:ca:0d:2b:eb"
                                ->1.object

var obj = msg.payload;
var json = JSON.parse(obj);


var MAC = json["networkInterfaces"]["Wi-Fi"][0].mac;

msg.payload = MAC;
return msg;

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i did added [0] and manage to extract data.

Thank you for your assistant. Without your feedback i am unable to get solution.

You are welcome.