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Define a non-enumerable property on an object.
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Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.

Please consider following this project's author, Jon Schlinkert, and consider starring the project to show your ❤️ and support.


Install with npm:

$ npm install --save define-property

Release history

See the CHANGELOG for updates.



  • object: The object on which to define the property.
  • key: The name of the property to be defined or modified.
  • value: The value or descriptor of the property being defined or modified.
var define = require('define-property');
var obj = {};
define(obj, 'foo', function(val) {
  return val.toUpperCase();

// by default, defined properties are non-enumberable
//=> {}

//=> 'BAR'

defining setters/getters

Pass the same properties you would if using Object.defineProperty or Reflect.defineProperty.

define(obj, 'foo', {
  set: function() {},
  get: function() {}



Pull requests and stars are always welcome. For bugs and feature requests, please create an issue.

Running Tests

Running and reviewing unit tests is a great way to get familiarized with a library and its API. You can install dependencies and run tests with the following command:

$ npm install && npm test
Building docs

(This project's is generated by verb, please don't edit the readme directly. Any changes to the readme must be made in the readme template.)

To generate the readme, run the following command:

$ npm install -g verbose/verb#dev verb-generate-readme && verb

Related projects

You might also be interested in these projects:

  • assign-deep: Deeply assign the enumerable properties and/or es6 Symbol properies of source objects to the target… more | homepage
  • extend-shallow: Extend an object with the properties of additional objects. node.js/javascript util. | homepage
  • merge-deep: Recursively merge values in a javascript object. | homepage
  • mixin-deep: Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone. | homepage


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Jon Schlinkert


Copyright © 2018, Jon Schlinkert. Released under the MIT License.

This file was generated by verb-generate-readme, v0.6.0, on January 25, 2018.

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