The Object.getOwnPropertyNames() method returns an array of all properties (including non-enumerable properties except for those which use Symbol) found directly in a given object.




The object whose enumerable and non-enumerable properties are to be returned.

Return value

An array of strings that corresponds to the properties found directly in the given object.


Object.getOwnPropertyNames() returns an array whose elements are strings corresponding to the enumerable and non-enumerable properties found directly in a given object obj. The ordering of the enumerable properties in the array is consistent with the ordering exposed by a for...in loop (or by Object.keys()) over the properties of the object. According to ES6, the integer keys of the object (both enumerable and non-enumerable) are added in ascending order to the array first, followed by the string keys in the order of insertion.

In ES5, if the argument to this method is not an object (a primitive), then it will cause a TypeError. In ES2015, a non-object argument will be coerced to an object.

// TypeError: "foo" is not an object (ES5 code)

// ["0", "1", "2", "length"]  (ES2015 code)


Using Object.getOwnPropertyNames()

var arr = ['a', 'b', 'c'];
console.log(Object.getOwnPropertyNames(arr).sort()); // .sort() is an array method.
// logs ["0", "1", "2", "length"]

// Array-like object
var obj = { 0: 'a', 1: 'b', 2: 'c' };
console.log(Object.getOwnPropertyNames(obj).sort()); // .sort() is an array method.
// logs ["0", "1", "2"]

// Logging property names and values using Array.forEach
  function (val, idx, array) {
    console.log(val + ' -> ' + obj[val]);
// logs
// 0 -> a
// 1 -> b
// 2 -> c

// non-enumerable property
var my_obj = Object.create({}, {
  getFoo: {
    value: function() { return this.foo; },
    enumerable: false
my_obj.foo = 1;

// logs ["foo", "getFoo"]

If you want only the enumerable properties, see Object.keys() or use a for...in loop (note that this will also return enumerable properties found along the prototype chain for the object unless the latter is filtered with hasOwnProperty()).

Items on the prototype chain are not listed:

function ParentClass() {}
ParentClass.prototype.inheritedMethod = function() {};

function ChildClass() {
  this.prop = 5;
  this.method = function() {};
ChildClass.prototype = new ParentClass;
ChildClass.prototype.prototypeMethod = function() {};

    new ChildClass() // ["prop", "method"]

Get non-enumerable properties only

This uses the Array.prototype.filter() function to remove the enumerable keys (obtained with Object.keys()) from a list of all keys (obtained with Object.getOwnPropertyNames()) thus giving only the non-enumerable keys as output.

var target = myObject;
var enum_and_nonenum = Object.getOwnPropertyNames(target);
var enum_only = Object.keys(target);
var nonenum_only = enum_and_nonenum.filter(function(key) {
  var indexInEnum = enum_only.indexOf(key);
  if (indexInEnum == -1) {
    // Not found in enum_only keys,
    // meaning that the key is non-enumerable,
    // so return true so we keep this in the filter
    return true;
  } else {
    return false;



ECMAScript (ECMA-262)
The definition of 'Object.getOwnPropertyNames' in that specification.

Browser compatibility

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
getOwnPropertyNamesChrome Full support 5Edge Full support 12Firefox Full support 4IE Full support 9Opera Full support 12Safari Full support 5WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 12Safari iOS Full support 5Samsung Internet Android Full support 1.0nodejs Full support Yes


Full support  
Full support

See also