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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 :heart: and support.


Install with npm:

$ npm install --save define-property

Release history

See the CHANGELOG for updates.



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() {}


Contributing Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new).
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: ```sh $ 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: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ```

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Commits Contributor
28 jonschlinkert
1 doowb


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.