Access the object

yes!!
It's working. Thank you so much!!!

Please could you explain me this same thing.

and how can I get both of them (minvalue and maxvalue) using single function. (Actually, I want to subtract so ....)

const agg1 = msg.payload[0].Agg1_Total_Weight
const minvalue = agg1.minvalue
const maxvalue = agg1.maxvalue
const difference = maxvalue - minvalue
return { payload: { minvalue, maxvalue, difference } }

This will output a msg like:

msg.payload: {
  minvalue: 1000,
  maxvalue: 2000,
  difference: 1000
}

Thank you very much!!
Please could you guide me how can I learn this.

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