PUsh to reopen PR

Author: Luuk Peters

16/umbraco-cms/customizing/extending-overview/extension-registry/register-extensions.md

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 # Register Extensions
 Whether you are looking to make extensions in the context of an Umbraco project or a package, you always need a specific JSON file for this: the umbraco-package.json file. This is the starting point for any extension.
 
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 ## Umbraco-package.json
 To get extensions registered in Umbraco, you need to have an `umbraco-package.json` file. This file must be located in or in a subfolder of either the `App_Plugins` folder or the `wwwroot` folder. It's recommended to place the file in `App_Plugins/#YOUR_EXTENSION_NAME#/umbraco-package.json`, or in `wwwroot/App_Plugins/#YOUR_EXTENSION_NAME#/umbraco-package.json` for packages and Razor Class Libraries. Umbraco scans for these files on boot and reads the [`Extension Manifests`](extension-manifest.md) that are present in the file to register the extensions.