---
title: app.json / app.config.js
description: A reference of available properties in Expo app config.
maxHeadingDepth: 5
---
The following is a list of properties that are available for you under the `"expo"` key in **app.json** or **app.config.json**. These properties can be passed to the top level object of **app.config.js** or **app.config.ts**.
## Properties