---
title: containerIdentifier
framework: CloudKit JS
role: symbol
role_heading: Instance Property
platforms: [cloudkit js 1.0+]
path: cloudkitjs/cloudkit.container/containeridentifier
---

# containerIdentifier

The string that identifies the app’s container.

## Declaration

```data
readonly attribute String containerIdentifier;
```

## See Also

### Getting the Identifier and Environment

- [environment](cloudkitjs/cloudkit.container/environment.md)
- [apnsEnvironment](cloudkitjs/cloudkit.container/apnsenvironment.md)