how to change key of an object in js code example

Example 1: change object key name javascript es6

const countries = [
    {"id": 1, "name": "Afghanistan"},
    {"id": 2, "name": "Albania"},
    {"id": 3, "name": "Algeria"},
    {"id": 4, "name": "American Samoa"}
];
const transformed = countries.map(({ id: label, name: value }) => ({ label, value }));
console.log(transformed);

Example 2: js rename property

function renameProperty(obj, oldName, newName) {
  obj[newName] = obj[oldName];
  delete obj[oldName];
}