---
title: CNContactIdentifierKey
framework: contacts
role: symbol
role_heading: Global Variable
path: contacts/cncontactidentifierkey
---

# CNContactIdentifierKey

The contact’s unique identifier.

## Declaration

```swift
let CNContactIdentifierKey: String
```

## Discussion

Discussion This key takes a string value.

## See Also

### Contact Identification

- [CNContactTypeKey](contacts/cncontacttypekey.md)
- [CNContactPropertyAttribute](contacts/cncontactpropertyattribute.md)