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Object.getOwnPropertyNames Redirect 1


The Object.getOwnPropertyNames() method returns an array of all properties (enumerable or not) found directly upon a given object.




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


Object.getOwnPropertyNames returns an array whose elements are strings corresponding to the enumerable and non-enumerable properties found directly upon 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. The ordering of the non-enumerable properties in the array, and among the enumerable properties, is not defined.


var arr = ["a", "b", "c"];
print(Object.getOwnPropertyNames(arr).sort()); // prints "0,1,2,length"

// Array-like object
var obj = { 0: "a", 1: "b", 2: "c"};
print(Object.getOwnPropertyNames(obj).sort()); // prints "0,1,2"

// Printing property names and values using Array.forEach
Object.getOwnPropertyNames(obj).forEach(function(val, idx, array) {
  print(val + " -> " + obj[val]);
// prints
// 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;

print(Object.getOwnPropertyNames(my_obj).sort()); // prints "foo, getFoo"

If you want only the enumerable properties, see Object.keys or use a for...in loop (although note that this will return enumerable properties not found directly upon that object but also 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"]


Specification Status Comment
ECMAScript 5.1 (ECMA-262)
The definition of 'Object.getOwnPropertyNames' in that specification.
Standard Initial definition.
Implemented in JavaScript 1.8.5
ECMAScript 6 (ECMA-262)
The definition of 'Object.getOwnPropertyNames' in that specification.

Browser compatibility

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support 4 (2.0) 5 9 12 5
Feature Firefox Mobile (Gecko) Android IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ?

Based on Kangax's compat table.

See also

Document Tags and Contributors

Last updated by: Sheppy,