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medusa-store/www/apps/book/app/basics/modules-directory-structure/page.mdx
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export const metadata = {
title: `${pageNumber} Modules Directory Structure`,
}
# {metadata.title}
In this document, you'll learn about the expected files and directories in your module.
![Module Directory Structure Example](https://res.cloudinary.com/dza7lstvk/image/upload/v1714379976/Medusa%20Book/modules-dir-overview_nqq7ne.jpg)
## index.ts
The `index.ts` file in the root of your module's directory is the only required file. It must export the module's definition as explained in a [previous chapter](../modules-and-services/page.mdx).
---
## service.ts
A module must have a main service. It's created in the `service.ts` file at the root of your module directory as explained in a [previous chapter](../modules-and-services/page.mdx).
---
## Other Directories
The following directories are optional and their content are explained more in the following chapters:
- `models`: Holds the data models representing tables in the database.
- `migrations`: Holds the migration files used to reflect changes on the database.
- `loaders`: Holds the scripts to run on the Medusa application's start-up.