Sign-up
Amplify provides a client library that enables you to interact with backend resources such as Amplify Auth.
To get started, you can use the signUp() API to create a new user in your backend:
/// Signs a user up with a username, password, and email. The required/// attributes may be different depending on your app's configuration.Future<void> signUpUser({ required String username, required String password, required String email, String? phoneNumber,}) async { try { final userAttributes = { AuthUserAttributeKey.email: email, if (phoneNumber != null) AuthUserAttributeKey.phoneNumber: phoneNumber, // additional attributes as needed }; final result = await Amplify.Auth.signUp( username: username, password: password, options: SignUpOptions( userAttributes: userAttributes, ), ); await _handleSignUpResult(result); } on AuthException catch (e) { safePrint('Error signing up user: ${e.message}'); }}Future<void> _handleSignUpResult(SignUpResult result) async { switch (result.nextStep.signUpStep) { case AuthSignUpStep.confirmSignUp: final codeDeliveryDetails = result.nextStep.codeDeliveryDetails!; _handleCodeDelivery(codeDeliveryDetails); break; case AuthSignUpStep.done: safePrint('Sign up is complete'); break; }}
void _handleCodeDelivery(AuthCodeDeliveryDetails codeDeliveryDetails) { safePrint( 'A confirmation code has been sent to ${codeDeliveryDetails.destination}. ' 'Please check your ${codeDeliveryDetails.deliveryMedium.name} for the code.', );}The signUp API response will include a nextStep property, which can be used to determine if further action is required. It may return the following next steps:
CONFIRM_SIGN_UP- The sign up needs to be confirmed by collecting a code from the user and callingconfirmSignUp.DONE- The sign up process has been fully completed.COMPLETE_AUTO_SIGN_IN- The sign up process needs to complete by invoking theautoSignInAPI.
Confirm sign-up
By default, each user that signs up remains in the unconfirmed status until they verify with a confirmation code that was sent to their email or phone number. The following are the default verification methods used when either phone or email are used as loginWith options.
| Login option | User account verification channel |
|---|---|
phone | Phone Number |
email | |
email and phone |
You can confirm the sign-up after receiving a confirmation code from the user:
Future<void> confirmUser({ required String username, required String confirmationCode,}) async { try { final result = await Amplify.Auth.confirmSignUp( username: username, confirmationCode: confirmationCode, ); // Check if further confirmations are needed or if // the sign up is complete. await _handleSignUpResult(result); } on AuthException catch (e) { safePrint('Error confirming user: ${e.message}'); }}