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The question is not very clear but if I understand correct you want to get the value from the first object depending on the status code you get from the api. In this case you need to:
Turn the json into an object, use JSON.parse()
let a = {"T1": "online", "T2": "offline"};
let b = {StatusCode: "T1"};
you will be able to access the variable like so:
a[b.StatusCode];
Source:stackexchange.com