auth0-vue

SKILL.md

Auth0 Vue.js Integration

Add authentication to Vue.js 3 single-page applications using @auth0/auth0-vue.

Prerequisites

Vue 3+ application (Vite or Vue CLI)

Auth0 account and application configured

If you don't have Auth0 set up yet, use the auth0-quickstart skill first

When NOT to Use

Server-side rendered Vue apps - See Auth0 Nuxt.js guide for SSR patterns

Vue 2 applications - This SDK requires Vue 3+, use legacy @auth0/auth0-spa-js wrapper

Embedded login - This SDK uses Auth0 Universal Login (redirect-based)

Backend API authentication - Use express-openid-connect or JWT validation instead

Quick Start Workflow

1. Install SDK

npm install @auth0/auth0-vue

2. Configure Environment

For automated setup with Auth0 CLI, see Setup Guide for complete scripts.

For manual setup:

Create .env file:

VITE_AUTH0_DOMAIN=your-tenant.auth0.com
VITE_AUTH0_CLIENT_ID=your-client-id

3. Configure Auth0 Plugin

Update src/main.ts:

import { createApp } from 'vue';
import { createAuth0 } from '@auth0/auth0-vue';
import App from './App.vue';

const app = createApp(App);

app.use(
  createAuth0({
    domain: import.meta.env.VITE_AUTH0_DOMAIN,
    clientId: import.meta.env.VITE_AUTH0_CLIENT_ID,
    authorizationParams: {
      redirect_uri: window.location.origin
    }
  })
);

app.mount('#app');

4. Add Authentication UI

Create a login component:

<script setup lang="ts">
import { useAuth0 } from '@auth0/auth0-vue';

const { loginWithRedirect, logout, isAuthenticated, user, isLoading } = useAuth0();
</script>

<template>
  <div>
    <div v-if="isLoading">Loading...</div>

    <div v-else-if="isAuthenticated">
      <img :src="user?.picture" :alt="user?.name" />
      <span>Welcome, {{ user?.name }}</span>
      <button @click="logout({ logoutParams: { returnTo: window.location.origin }})">
        Logout
      </button>
    </div>

    <button v-else @click="loginWithRedirect()">
      Login
    </button>
  </div>
</template>

5. Test Authentication

Start your dev server and test the login flow:

npm run dev

Detailed Documentation

Setup Guide - Automated setup scripts (Bash/PowerShell), CLI commands, manual configuration

Integration Guide - Protected routes, API calls, error handling, composables

API Reference - Complete SDK API, configuration options, composables reference, testing strategies

Common Mistakes

Mistake
Fix

Forgot to add redirect URI in Auth0 Dashboard
Add your application URL (e.g., http://localhost:3000, https://app.example.com) to Allowed Callback URLs in Auth0 Dashboard

Using wrong env var prefix
Vite requires VITE_ prefix, Vue CLI uses VUE_APP_

Not handling loading state
Always check isLoading before rendering auth-dependent UI

Storing tokens in localStorage
Never manually store tokens - SDK handles secure storage automatically

Missing createAuth0 plugin registration
Must call app.use(createAuth0({...})) before mounting app

Accessing auth before plugin loads
Wrap auth-dependent code in v-if="!isLoading"

Related Skills

auth0-quickstart - Basic Auth0 setup

auth0-migration - Migrate from another auth provider

auth0-mfa - Add Multi-Factor Authentication

auth0-cli - Manage Auth0 resources from the terminal

Quick Reference

Core Composables:

useAuth0() - Main authentication composable

isAuthenticated - Reactive check if user is logged in

user - Reactive user profile information

loginWithRedirect() - Initiate login

logout() - Log out user

getAccessTokenSilently() - Get access token for API calls

Common Use Cases:

Login/Logout buttons → See Step 4 above

Protected routes with navigation guards → Integration Guide

API calls with tokens → Integration Guide

Error handling → Integration Guide

References

Auth0 Vue SDK Documentation

Auth0 Vue Quickstart

SDK GitHub Repository