---
title: extensionOutput
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/aspasskeyregistrationcredential/extensionoutput-2lf9m
---

# extensionOutput

An output from WebAuthn extensions.

## Declaration

```swift
var extensionOutput: ASPasskeyRegistrationCredentialExtensionOutput? { get set }
```

## See Also

### Accessing extension output

- [ASPasskeyRegistrationCredentialExtensionOutput](authenticationservices/aspasskeyregistrationcredentialextensionoutput-swift.struct.md)