# map-obj [](https://travis-ci.org/sindresorhus/map-obj) > Map object keys and values into a new object ## Install ``` $ npm install map-obj ``` ## Usage ```js const mapObject = require('map-obj'); const newObject = mapObject({foo: 'bar'}, (key, value) => [value, key]); //=> {bar: 'foo'} ``` ## API ### mapObject(source, mapper, options?) #### source Type: `object` Source object to copy properties from. #### mapper Type: `Function` Mapping function. - It has signature `mapper(sourceKey, sourceValue, source)`. - It must return a two item array: `[targetKey, targetValue]`. #### options Type: `object` ##### deep Type: `boolean`<br> Default: `false` Recurse nested objects and objects in arrays. ##### target Type: `object`<br> Default: `{}` Target object to map properties on to. ## Related - [filter-obj](https://github.com/sindresorhus/filter-obj) - Filter object keys and values into a new object --- <div align="center"> <b> <a href="https://tidelift.com/subscription/pkg/npm-map-obj?utm_source=npm-map-obj&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a> </b> <br> <sub> Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies. </sub> </div>