# mixin-deep [](https://www.npmjs.com/package/mixin-deep) [](https://npmjs.org/package/mixin-deep) [](https://npmjs.org/package/mixin-deep) [](https://travis-ci.org/jonschlinkert/mixin-deep) > Deeply mix the properties of objects into the first object. Like merge-deep, but doesn't clone. Please consider following this project's author, [Jon Schlinkert](https://github.com/jonschlinkert), and consider starring the project to show your :heart: and support. ## Install Install with [npm](https://www.npmjs.com/): ```sh $ npm install --save mixin-deep ``` ## Usage ```js var mixinDeep = require('mixin-deep'); mixinDeep({a: {aa: 'aa'}}, {a: {bb: 'bb'}}, {a: {cc: 'cc'}}); //=> { a: { aa: 'aa', bb: 'bb', cc: 'cc' } } ``` ## About <details> <summary><strong>Contributing</strong></summary> Pull requests and stars are always welcome. For bugs and feature requests, [please create an issue](../../issues/new). </details> <details> <summary><strong>Running Tests</strong></summary> 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 ``` </details> <details> <summary><strong>Building docs</strong></summary> _(This project's readme.md is generated by [verb](https://github.com/verbose/verb-generate-readme), please don't edit the readme directly. Any changes to the readme must be made in the [.verb.md](.verb.md) readme template.)_ To generate the readme, run the following command: ```sh $ npm install -g verbose/verb#dev verb-generate-readme && verb ``` </details> ### Related projects You might also be interested in these projects: * [defaults-deep](https://www.npmjs.com/package/defaults-deep): Like `extend` but recursively copies only the missing properties/values to the target object. | [homepage](https://github.com/jonschlinkert/defaults-deep "Like `extend` but recursively copies only the missing properties/values to the target object.") * [extend-shallow](https://www.npmjs.com/package/extend-shallow): Extend an object with the properties of additional objects. node.js/javascript util. | [homepage](https://github.com/jonschlinkert/extend-shallow "Extend an object with the properties of additional objects. node.js/javascript util.") * [merge-deep](https://www.npmjs.com/package/merge-deep): Recursively merge values in a javascript object. | [homepage](https://github.com/jonschlinkert/merge-deep "Recursively merge values in a javascript object.") * [mixin-object](https://www.npmjs.com/package/mixin-object): Mixin the own and inherited properties of other objects onto the first object. Pass an… [more](https://github.com/jonschlinkert/mixin-object) | [homepage](https://github.com/jonschlinkert/mixin-object "Mixin the own and inherited properties of other objects onto the first object. Pass an empty object as the first arg to shallow clone.") ### Author **Jon Schlinkert** * [linkedin/in/jonschlinkert](https://linkedin.com/in/jonschlinkert) * [github/jonschlinkert](https://github.com/jonschlinkert) * [twitter/jonschlinkert](https://twitter.com/jonschlinkert) ### License Copyright © 2017, [Jon Schlinkert](https://github.com/jonschlinkert). Released under the [MIT License](LICENSE). *** _This file was generated by [verb-generate-readme](https://github.com/verbose/verb-generate-readme), v0.6.0, on December 09, 2017._