[Home](./index.md) > [@firebase/auth](./auth.md) > [ConfirmationResult](./auth.confirmationresult.md) > [verificationId](./auth.confirmationresult.verificationid.md) ## ConfirmationResult.verificationId property The phone number authentication operation's verification ID. Signature: ```typescript readonly verificationId: string; ``` ## Remarks This can be used along with the verification code to initialize a [PhoneAuthCredential](./auth.phoneauthcredential.md).