---
title: App Asset Library reference data
framework: App Store Connect API
role: collectionGroup
role_heading: API Collection
path: appstoreconnectapi/app-asset-library-reference-data
---

# App Asset Library reference data

Discover the valid asset specifications, placement groups, and limits for placements.

## Overview

Overview The appAssetLibraryRefData resource represents reference data that describes the valid asset specifications, dimensions, placement groups, and per-placement limits for the asset library. Use it to: List the reference data for the asset library. Read a specific reference data resource. Query the reference data to learn what’s valid for a placement type before you upload an asset, instead of hard-coding specifications.

## Topics

### Getting reference data

- [List app asset library ref data](appstoreconnectapi/get-v1-appassetlibraryrefdata.md)
- [Read an app asset library ref data](appstoreconnectapi/get-v1-appassetlibraryrefdata-_id_.md)

### Objects and types

- [AppAssetLibraryRefDatum](appstoreconnectapi/appassetlibraryrefdatum.md)
- [AppAssetLibraryRefDataResponse](appstoreconnectapi/appassetlibraryrefdataresponse.md)
- [AppAssetLibraryRefDatumResponse](appstoreconnectapi/appassetlibraryrefdatumresponse.md)