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How do I add new attribute (element) to JSON object using JavaScript?

What I have tried:

I dont know everything. please tell me please
Updated 5-Nov-20 7:05am

var o = { Prop1: "Hello" }; // original JSON object
o.Prop2 = "World"; // add "Prop2" to it
console.log(o); // {Prop1: "Hello", Prop2: "World"}

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