What is the difference between Object.getOwnPropertyNames() and Object.keys() methods?

Object.keys() returns an array of strings - the names of the enumerable properties of the object. Object.getOwnPropertyNames() returns an array of strings - the names of all properties of the object (including non-enumerable ones), except for symbol properties.

Example:

const obj = {
  a: 1,
  b: 2
};

Object.defineProperty(obj, 'c', {
  value: 3,
  enumerable: false
});

console.log(Object.keys(obj)); // Output: [ 'a', 'b' ]
console.log(Object.getOwnPropertyNames(obj)); // Output: [ 'a', 'b', 'c' ]