---
title: typeIdentifierKey
framework: foundation
role: symbol
role_heading: Type Property
path: foundation/urlresourcekey/typeidentifierkey
---

# typeIdentifierKey

The resource’s uniform type identifier (UTI), returned as an NSString object (read-only).

## Declaration

```swift
static let typeIdentifierKey: URLResourceKey
```

## See Also

### Other resource keys

- [keysOfUnsetValuesKey](foundation/urlresourcekey/keysofunsetvalueskey.md)
- [quarantinePropertiesKey](foundation/urlresourcekey/quarantinepropertieskey.md)
- [addedToDirectoryDateKey](foundation/urlresourcekey/addedtodirectorydatekey.md)
- [attributeModificationDateKey](foundation/urlresourcekey/attributemodificationdatekey.md)
- [contentAccessDateKey](foundation/urlresourcekey/contentaccessdatekey.md)
- [contentModificationDateKey](foundation/urlresourcekey/contentmodificationdatekey.md)
- [creationDateKey](foundation/urlresourcekey/creationdatekey.md)
- [customIconKey](foundation/urlresourcekey/customiconkey.md)
- [documentIdentifierKey](foundation/urlresourcekey/documentidentifierkey.md)
- [effectiveIconKey](foundation/urlresourcekey/effectiveiconkey.md)
- [generationIdentifierKey](foundation/urlresourcekey/generationidentifierkey.md)
- [hasHiddenExtensionKey](foundation/urlresourcekey/hashiddenextensionkey.md)
- [isExcludedFromBackupKey](foundation/urlresourcekey/isexcludedfrombackupkey.md)
- [isExecutableKey](foundation/urlresourcekey/isexecutablekey.md)
- [isHiddenKey](foundation/urlresourcekey/ishiddenkey.md)