Advanced Usage

useAuthenticator

@aws-amplify/ui-vue ships with useAuthenticator Vue composable that can be used to access, modify, and update Authenticator's auth state. To use them, make sure the <authenticator> is present in the component or parent component:

<script setup>
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  const auth = useAuthenticator();
</script>

<template>
  <authenticator></authenticator>
  <button @click="auth.signOut">Sign Out</button>
</template>

Note that the auth is an object wrapped with reactive, meaning there is no need to write .value after getters but, like props in setup, we cannot destructure it:

<script setup>
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  const { signOut } = useAuthenticator();
  // ❌ This won't work because it breaks reactivity
  // it's the same as destructuring from `props`
</script>

In order to extract properties from the authenticator while keeping its reactivity, you need to use toRefs. It will create refs for any reactive property:

<script setup>
  import { toRefs } from 'vue';
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  // `route` `user` and `signOut` all are reactive.
  const { route, user, signOut } = toRefs(useAuthenticator());
</script>

Access Auth State

You can use useAuthenticator composable to access route string that represents the current authState. They can be one of:

• idle
• setup
• signIn
• signUp
• confirmSignIn
• confirmSignUp
• setupTotp
• forceNewPassword
• forgotPassword
• confirmResetPassword
• verifyUser
• confirmVerifyUser
• signOut
• authenticated

<script setup>
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  const auth = useAuthenticator();
</script>

<template>
  <authenticator></authenticator>
  <template v-if="auth.route === 'authenticated'">
    <button @click="auth.signOut">Sign out</button>
  </template>
</template>

Authentication Check

If you just need to check if you're authenticated or not, you can use the more straightforward useAuthenticator composable to access the authStatus string. The authStatus string can represent the following states:

• configuring
• authenticated
• unauthenticated

The configuring state only occurs when the Authenticator is first loading.

<script setup>
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  const auth = useAuthenticator();
</script>

<template>
  <authenticator></authenticator>
  <template v-if="auth.authStatus === 'configuring'">
    <button @click="auth.signOut">Loading...</button>
  </template>
  <template v-if="auth.authStatus === 'authenticated'">
    <button @click="auth.signOut">Sign out</button>
  </template>
</template>

Access Authenticated User

You can use useAuthenticator composable to access current signed in user. If no user is authenticated, it'll return undefined.

<script setup>
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  const auth = useAuthenticator();
</script>

<template>
  <authenticator></authenticator>
  <template v-if="auth.route === 'authenticated'">
    <h1>Hello {{ auth.user?.username }}!</h1>
    <button @click="auth.signOut">Sign out</button>
  </template>
</template>

Trigger Transitions

You can use useAuthenticator composable to access functions that lets you trigger transitions to the authenticator. Please see Full API to see all supported transition functions. Any invalid transitions (e.g. signUp directly to authenticated) will be ignored.

<script setup>
  import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
  const auth = useAuthenticator();
</script>

<template>
  <authenticator></authenticator>
  <template v-if="auth.route === 'authenticated'">
    <h1>Hello {{ auth.user?.username }}!</h1>
    <button @click="auth.signOut">Sign out</button>
  </template>
</template>

Example

Here's an example that uses the toForgotPassword trigger transition, to create a custom button. Note that example uses the Footer "slot" override.

<script setup lang="ts">
import { toRefs } from 'vue';
import { Amplify } from 'aws-amplify';
import { Authenticator, useAuthenticator } from '@aws-amplify/ui-vue';
import '@aws-amplify/ui-vue/styles.css';
import aws_exports from './aws-exports';

Amplify.configure(aws_exports);

const { toForgotPassword } = toRefs(useAuthenticator());
</script>

<template>
  <authenticator>
    <template v-slot:sign-in-footer>
      <div style="text-align: center">
        <button
          @click="toForgotPassword"
          class="amplify-button amplify-field-group__control"
          data-fullwidth="false"
          data-size="small"
          type="button"
          style="font-weight: normal"
        >
          Forgot Password???
        </button>
      </div>
    </template>
  </authenticator>
</template>

Full API

Below is the full list of context that useAuthenticator composable returns.