auth0-angular

SKILL.md

Auth0 Angular Integration

Add authentication to Angular applications using @auth0/auth0-angular.

Prerequisites

Angular 13+ application

Auth0 account and application configured

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

When NOT to Use

AngularJS (1.x) - This SDK requires Angular 13+, use legacy solutions for AngularJS

Mobile applications - Use auth0-react-native for React Native or native SDKs for Ionic

Backend APIs - Use JWT validation middleware for your server language

Quick Start Workflow

1. Install SDK

npm install @auth0/auth0-angular

2. Configure Environment

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

For manual setup:

Update src/environments/environment.ts:

export const environment = {
  production: false,
  auth0: {
    domain: 'your-tenant.auth0.com',
    clientId: 'your-client-id',
    authorizationParams: {
      redirect_uri: window.location.origin
    }
  }
};

3. Configure Auth Module

For standalone components (Angular 14+):

Update src/app/app.config.ts:

import { ApplicationConfig } from '@angular/core';
import { provideAuth0 } from '@auth0/auth0-angular';
import { environment } from '../environments/environment';

export const appConfig: ApplicationConfig = {
  providers: [
    provideAuth0({
      domain: environment.auth0.domain,
      clientId: environment.auth0.clientId,
      authorizationParams: environment.auth0.authorizationParams
    })
  ]
};

For NgModule-based apps:

Update src/app/app.module.ts:

import { AuthModule } from '@auth0/auth0-angular';
import { environment } from '../environments/environment';

@NgModule({
  imports: [
    AuthModule.forRoot({
      domain: environment.auth0.domain,
      clientId: environment.auth0.clientId,
      authorizationParams: environment.auth0.authorizationParams
    })
  ]
})
export class AppModule {}

4. Add Authentication UI

Update src/app/app.component.ts:

import { Component } from '@angular/core';
import { AuthService } from '@auth0/auth0-angular';

@Component({
  selector: 'app-root',
  template: `
    <div *ngIf="auth.isLoading$ | async; else loaded">
      <p>Loading...</p>
    </div>

    <ng-template #loaded>
      <ng-container *ngIf="auth.isAuthenticated$ | async; else loggedOut">
        <div *ngIf="auth.user$ | async as user">
          <img [src]="user.picture" [alt]="user.name" />
          <h2>Welcome, {{ user.name }}!</h2>
          <button (click)="logout()">Logout</button>
        </div>
      </ng-container>

      <ng-template #loggedOut">
        <button (click)="login()">Login</button>
      </ng-template>
    </ng-template>
  `
})
export class AppComponent {
  constructor(public auth: AuthService) {}

  login(): void {
    this.auth.loginWithRedirect();
  }

  logout(): void {
    this.auth.logout({ logoutParams: { returnTo: window.location.origin } });
  }
}

5. Test Authentication

Start your dev server and test the login flow:

ng serve

Detailed Documentation

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

Integration Guide - Protected routes with guards, HTTP interceptors, error handling

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

Common Mistakes

Mistake
Fix

Forgot to add redirect URI in Auth0 Dashboard
Add your application URL (e.g., http://localhost:4200, https://app.example.com) to Allowed Callback URLs in Auth0 Dashboard

Not configuring AuthModule properly
Must call AuthModule.forRoot() in NgModule or provideAuth0() in standalone config

Accessing auth before initialization
Use isLoading$ observable to wait for SDK initialization

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

No token sent to API
Use either authHttpInterceptorFn for automatic token attachment, or getAccessTokenSilently() for manual control — see Integration Guide

Route guard not protecting routes
Apply AuthGuard (or authGuardFn) to protected routes in routing config

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 Services:

AuthService - Main authentication service

isAuthenticated$ - Observable check if user is logged in

user$ - Observable user profile information

loginWithRedirect() - Initiate login

logout() - Log out user

getAccessTokenSilently() - Get access token manually (alternative to HTTP interceptor)

Common Use Cases:

Login/Logout buttons → See Step 4 above

Protected routes with guards → Integration Guide

Calling a protected API → Integration Guide

Error handling → Integration Guide

References

Auth0 Angular SDK Documentation

Auth0 Angular Quickstart

SDK GitHub Repository