Object keys are stored in insertion order

const obj = {
  name: "Human",
  age: 0,
  address: "Earth",
  profession: "Coder",
};

console.log(Object.keys(obj)); // name, age, address, profession

Objects maintain the order in which the keys were created.

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Comments

[Yousaf]

ES6 defines standard rules for the order of properties in an object. See this stackoverflow question to understand the order of properties in an object.