# Marketplace reference

> The details you look up. The hacs.json file, where your files go, and what is checked before an install.

Source: https://contributors.home-assistant.io/marketplace/reference/

The pages in this section are for looking things up. For how to use them, start with the [guides](https://contributors.home-assistant.io/marketplace/guides/).

- [hacs.json](https://contributors.home-assistant.io/marketplace/reference/hacs-json/): every key of the file, and what the Marketplace does with it.
- [Repository structure](https://contributors.home-assistant.io/marketplace/reference/repository-structure/): where the files go, per type.
- [Validation checks](https://contributors.home-assistant.io/marketplace/reference/validation/): what the HACS action checks, and what the Marketplace refuses to install.