# @babel/plugin-transform-duplicate-keys > Compile objects with duplicate keys to valid strict ES5 See our website [@babel/plugin-transform-duplicate-keys](https://new.babeljs.io/docs/en/next/babel-plugin-transform-duplicate-keys.html) for more information. ## Install Using npm: ```sh npm install --save @babel/plugin-transform-duplicate-keys ``` or using yarn: ```sh yarn add --save @babel/plugin-transform-duplicate-keys ```