objectGetOwnPropertyNames.js

let obj = {
  key1: "value1",
  key2: "value2",
  key3: "value3"
}
let items = Object.getOwnPropertyNames(obj);
console.log(items);
// ["key1", "key2", "key3"]
items.map(key => {
 let value = obj[key];
 console.log(key, value)
});
// key1 value1
// key2 value2
// key3 value3