The Object.defineProperties() method defines new or modifies existing properties directly on an object, returning the object.


Object.defineProperties(<var>obj</var>, <var>props</var>)


The object on which to define or modify properties.
An object whose own enumerable properties constitute descriptors for the properties to be defined or modified. Property descriptors present in objects come in two main flavors: data descriptors and accessor descriptors (see Object.defineProperty() for more details). Descriptors have the following keys:
true if and only if the type of this property descriptor may be changed and if the property may be deleted from the corresponding object.
Defaults to false.
true if and only if this property shows up during enumeration of the properties on the corresponding object.
Defaults to false.
The value associated with the property. Can be any valid JavaScript value (number, object, function, etc).
Defaults to undefined.
true if and only if the value associated with the property may be changed with an assignment operator.
Defaults to false.
A function which serves as a getter for the property, or undefined if there is no getter. The function return will be used as the value of property.
Defaults to undefined.
A function which serves as a setter for the property, or undefined if there is no setter. The function will receive as only argument the new value being assigned to the property.
Defaults to undefined.

Return value

The object that was passed to the function.


Object.defineProperties, in essence, defines all properties corresponding to the enumerable own properties of props on the object obj object.


var obj = {};
Object.defineProperties(obj, {
  "property1": {
    value: true,
    writable: true
  "property2": {
    value: "Hello",
    writable: false
  // etc. etc.


Assuming a pristine execution environment with all names and properties referring to their initial values, Object.defineProperties is almost completely equivalent (note the comment in isCallable) to the following reimplementation in JavaScript:

function defineProperties(obj, properties) {
  function convertToDescriptor(desc) {
    function hasProperty(obj, prop) {
      return Object.prototype.hasOwnProperty.call(obj, prop);

    function isCallable(v) {
      // NB: modify as necessary if other values than functions are callable.
      return typeof v === "function";

    if (typeof desc !== "object" || desc === null)
      throw new TypeError("bad desc");

    var d = {};

    if (hasProperty(desc, "enumerable"))
      d.enumerable = !!desc.enumerable;
    if (hasProperty(desc, "configurable"))
      d.configurable = !!desc.configurable;
    if (hasProperty(desc, "value"))
      d.value = desc.value;
    if (hasProperty(desc, "writable"))
      d.writable = !!desc.writable;
    if (hasProperty(desc, "get")) {
      var g = desc.get;

      if (!isCallable(g) && typeof g !== "undefined")
        throw new TypeError("bad get");
      d.get = g;
    if (hasProperty(desc, "set")) {
      var s = desc.set;
      if (!isCallable(s) && typeof s !== "undefined")
        throw new TypeError("bad set");
      d.set = s;

    if (("get" in d || "set" in d) && ("value" in d || "writable" in d))
      throw new TypeError("identity-confused descriptor");

    return d;

  if (typeof obj !== "object" || obj === null)
    throw new TypeError("bad obj");

  properties = Object(properties);

  var keys = Object.keys(properties);
  var descs = [];

  for (var i = 0; i < keys.length; i++)
    descs.push([keys[i], convertToDescriptor(properties[keys[i]])]);

  for (var i = 0; i < descs.length; i++)
    Object.defineProperty(obj, descs[i][0], descs[i][1]);

  return obj;


Specification Status Comment
ECMAScript 5.1 (ECMA-262)
The definition of 'Object.defineProperties' in that specification.
Standard Initial definition. Implemented in JavaScript 1.8.5
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'Object.defineProperties' in that specification.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'Object.defineProperties' in that specification.

Browser compatibility

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support 4.0 (2) 5 9 11.60 5
Feature Firefox Mobile (Gecko) Android IE Mobile Opera Mobile Safari Mobile
Basic support 4.0 (2) (Yes) ? 11.5 (Yes)

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

ECMAScript5 JavaScript Method Object