---
title: extensionInput
framework: authenticationservices
role: symbol
role_heading: Instance Property
path: authenticationservices/aspasskeycredentialrequest/extensioninput
---

# extensionInput

An input for WebAuthn extensions.

## Declaration

```swift
var extensionInput: ASPasskeyCredentialExtensionInput { get }
```

## See Also

### Viewing passkey challenge information

- [clientDataHash](authenticationservices/aspasskeycredentialrequest/clientdatahash.md)
- [userVerificationPreference](authenticationservices/aspasskeycredentialrequest/userverificationpreference.md)
- [supportedAlgorithms](authenticationservices/aspasskeycredentialrequest/supportedalgorithms-74mad.md)
- [ASPasskeyCredentialExtensionInput](authenticationservices/aspasskeycredentialextensioninput.md)