Export a C# Extension

Last modified: November 17, 2025

Introduction

This how-to describes how to export an extension so you can publish it in the Marketplace or share it directly with other Mendix developers.

Prerequisites

Before exporting an extension add-on module, ensure the following feature flag is enabled: --enable-extension-development

For more information, see Get Started with the Extensibility API.

Export an Extension

  1. In Studio Pro, open the app that contains your development extension.

  2. Create a new module with the same name as your extension folder. For example, if your extension folder is called MyFirstExtension, your module must also be called MyFirstExtension.

  3. In App Explorer, navigate to the Settings of this module and click the Export tab.

  4. Set Module type to Add-on module.

  5. In the Module version field, enter the version number of the extension.

  6. In the Extension Name field, select the name of your extension. This must match with your module name.

  7. Click OK to save the settings.

  8. In App Explorer, right-click the module and click Export to export the extension.

Now you can publish the extension in the Marketplace or directly share it with other Mendix developers.