<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macCatalyst: 26.0.0 -",
    "macOS: 15.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "Translation",
  "identifier" : "/documentation/Translation/TranslationSession/Response/clientIdentifier",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "Translation"
    ],
    "preciseIdentifier" : "s:11Translation0A7SessionC8ResponseV16clientIdentifierSSSgvp"
  },
  "title" : "clientIdentifier"
}
-->

# clientIdentifier

The unique identifier matching the client identifier set in the translation request.

```
let clientIdentifier: String?
```

## Discussion

Use this identifier to associate a translation request with its response.
If you set a client identifier in the translation request, that same identifier returns in the response.
If the request contained no identifier, this value is `nil`.

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)