Angular 12 Login and Registration example with JWT & Web Api

In this tutorial, we’re gonna build an Angular 12 Token based Authentication & Authorization (Login and Registration) Application with Web Api and JWT (including HttpInterceptor, Router & Form Validation). I will show you:

  • JWT Authentication Flow for User Registration (Signup) & User Login
  • Project Structure for Angular 12 Authentication with HttpInterceptor, Router
  • How to implement HttpInterceptor
  • Creating Login, Signup Components with Form Validation
  • Angular Components for accessing protected Resources
  • How to add a dynamic Navigation Bar to Angular App
  • Working with Browser Session Storage

Let’s explore together.

Related Posts:
In-depth Introduction to JWT-JSON Web Token
Angular CRUD Application example with Web API
Angular File upload example with Progress bar

Fullstack:
Angular 12 + Spring Boot: JWT Authentication & Authorization example
Angular 12 + Node.js Express: JWT Authentication & Authorization example

Overview of Angular 12 JWT Authentication example

We will build an Angular 12 JWT Authentication & Authorization application with Web Api in that:

  • There are Register, Login pages.
  • Form data will be validated by front-end before being sent to back-end.
  • Depending on User’s roles (admin, moderator, user), Navigation Bar changes its items automatically.
  • Services contain methods for sending HTTP requests & receiving reponses

Here are the screenshots of our app:

– Signup/Registration Page:

angular-12-jwt-authentication-authorization-example-user-registration

– Form Validation:

angular-12-jwt-authentication-authorization-example-form-validation

If you want to know more details about Form Validation, please visit:
Angular 12 Form Validation example (Reactive Forms)

– Login Page:

angular-12-jwt-authentication-authorization-example-user-login

– Profile Page:

angular-12-jwt-authentication-authorization-example-user-profile

– Navigation Bar for Admin account:

angular-12-jwt-authentication-authorization-example-admin-board

Demo

This is full Angular 10 (similar to this Angular version 12) JWT Authentication App (including form validation, check signup username/email duplicates, test authorization for 3 roles: Admin, Moderator, User) with Spring Boot Server:

In the video, we use Spring Boot for back-end REST APIs. You can find explanation and source code at:
Spring Boot JWT Authentication with Spring Security & MySQL
Spring Boot JWT Authentication with Spring Security & PostgreSQL
Spring Boot JWT Authentication with Spring Security & MongoDB

Logic is the same if you use following Node.js Express back-end:
Node.js + MySQL: JWT Authentication & Authorization example
Node.js + PostgreSQL: JWT Authentication & Authorization example
Node.js + MongoDB: User Authentication & Authorization with JWT

Flow for User Registration and User Login

For JWT – Token based Authentication with Web API, we’re gonna call 2 endpoints:

  • POST api/auth/signup for User Registration
  • POST api/auth/signin for User Login

You can take a look at following flow to have an overview of Requests and Responses that Angular 12 Client will make or receive.

angular-12-jwt-authentication-authorization-example-flow

Angular Client must add a JWT to HTTP Authorization Header before sending request to protected resources. This can be done by using HttpInterceptor.

Angular App Diagram with Router and HttpInterceptor

Now look at the diagram below.

angular-12-jwt-authentication-authorization-example-overview

– The App component is a container using Router. It gets user token & user information from Browser Session Storage via token-storage.service. Then the navbar now can display based on the user login state & roles.

Login & Register components have form for submission data (with support of Form Validation). They use token-storage.service for checking state and auth.service for sending signin/signup requests.

auth.service uses Angular HttpClient ($http service) to make authentication requests.
– every HTTP request by $http service will be inspected and transformed before being sent by auth-interceptor.

Home component is public for all visitor.

Profile component get user data from Session Storage.

BoardUser, BoardModerator, BoardAdmin components will be displayed depending on roles from Session Storage. In these components, we use user.service to get protected resources from API.

Technology

– Angular 12
– RxJS 6
– Angular CLI 12

Setup Angular 12 Project

Let’s open cmd and use Angular CLI to create a new Angular Project as following command:

ng new Angular12JwtAuth
? Would you like to add Angular routing? Yes
? Which stylesheet format would you like to use? CSS

We also need to generate some Components and Services:

ng g s _services/auth
ng g s _services/token-storage
ng g s _services/user

ng g c login
ng g c register
ng g c home
ng g c profile
ng g c board-admin
ng g c board-moderator
ng g c board-user

After the previous process is done, under src folder, let’s create _helpers folder and auth.interceptor.ts file inside.

Now you can see that our project directory structure looks like this.

Project Structure

angular-12-jwt-authentication-authorization-example-project-structure

Setup App Module

Open app.module.ts, then import FormsModule & HttpClientModule.
We also need to add authInterceptorProviders in providers. I will show you how to define it later on this tutorial (in auth.interceptor.ts).

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpClientModule } from '@angular/common/http';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { LoginComponent } from './login/login.component';
import { RegisterComponent } from './register/register.component';
import { HomeComponent } from './home/home.component';
import { ProfileComponent } from './profile/profile.component';
import { BoardAdminComponent } from './board-admin/board-admin.component';
import { BoardModeratorComponent } from './board-moderator/board-moderator.component';
import { BoardUserComponent } from './board-user/board-user.component';

import { authInterceptorProviders } from './_helpers/auth.interceptor';

@NgModule({
  declarations: [
    AppComponent,
    LoginComponent,
    RegisterComponent,
    HomeComponent,
    ProfileComponent,
    BoardAdminComponent,
    BoardModeratorComponent,
    BoardUserComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    FormsModule,
    HttpClientModule
  ],
  providers: [authInterceptorProviders],
  bootstrap: [AppComponent]
})
export class AppModule { }

Create Services

Authentication Service

This service sends signup, login HTTP POST requests to back-end.

_services/auth.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Observable } from 'rxjs';

const AUTH_API = 'http://localhost:8080/api/auth/';

const httpOptions = {
  headers: new HttpHeaders({ 'Content-Type': 'application/json' })
};

@Injectable({
  providedIn: 'root'
})
export class AuthService {
  constructor(private http: HttpClient) { }

  login(username: string, password: string): Observable<any> {
    return this.http.post(AUTH_API + 'signin', {
      username,
      password
    }, httpOptions);
  }

  register(username: string, email: string, password: string): Observable<any> {
    return this.http.post(AUTH_API + 'signup', {
      username,
      email,
      password
    }, httpOptions);
  }
}

Token Storage Service

TokenStorageService to manages token and user information (username, email, roles) inside Browser’s Session Storage. For Logout, we only need to clear this Session Storage.

_services/token-storage.service.ts

import { Injectable } from '@angular/core';

const TOKEN_KEY = 'auth-token';
const USER_KEY = 'auth-user';

@Injectable({
  providedIn: 'root'
})
export class TokenStorageService {
  constructor() { }

  signOut(): void {
    window.sessionStorage.clear();
  }

  public saveToken(token: string): void {
    window.sessionStorage.removeItem(TOKEN_KEY);
    window.sessionStorage.setItem(TOKEN_KEY, token);
  }

  public getToken(): string | null {
    return window.sessionStorage.getItem(TOKEN_KEY);
  }

  public saveUser(user: any): void {
    window.sessionStorage.removeItem(USER_KEY);
    window.sessionStorage.setItem(USER_KEY, JSON.stringify(user));
  }

  public getUser(): any {
    const user = window.sessionStorage.getItem(USER_KEY);
    if (user) {
      return JSON.parse(user);
    }

    return {};
  }
}

Data Service

This service provides methods to access public and protected resources.

_services/user.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

const API_URL = 'http://localhost:8080/api/test/';

@Injectable({
  providedIn: 'root'
})
export class UserService {
  constructor(private http: HttpClient) { }

  getPublicContent(): Observable<any> {
    return this.http.get(API_URL + 'all', { responseType: 'text' });
  }

  getUserBoard(): Observable<any> {
    return this.http.get(API_URL + 'user', { responseType: 'text' });
  }

  getModeratorBoard(): Observable<any> {
    return this.http.get(API_URL + 'mod', { responseType: 'text' });
  }

  getAdminBoard(): Observable<any> {
    return this.http.get(API_URL + 'admin', { responseType: 'text' });
  }
}

You can see that it’s simple because we have HttpInterceptor.

Http Interceptor

HttpInterceptor has intercept() method to inspect and transform HTTP requests before they are sent to server.

AuthInterceptor implements HttpInterceptor. We’re gonna add Authorization header with ‘Bearer’ prefix to the token.

_helpers/auth.interceptor.ts

import { HTTP_INTERCEPTORS, HttpEvent } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { HttpInterceptor, HttpHandler, HttpRequest } from '@angular/common/http';

import { TokenStorageService } from '../_services/token-storage.service';
import { Observable } from 'rxjs';

const TOKEN_HEADER_KEY = 'Authorization';       // for Spring Boot back-end

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
  constructor(private token: TokenStorageService) { }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    let authReq = req;
    const token = this.token.getToken();
    if (token != null) {
      authReq = req.clone({ headers: req.headers.set(TOKEN_HEADER_KEY, 'Bearer ' + token) });
    }
    return next.handle(authReq);
  }
}

export const authInterceptorProviders = [
  { provide: HTTP_INTERCEPTORS, useClass: AuthInterceptor, multi: true }
];

intercept() gets HTTPRequest object, change it and forward to HttpHandler object’s handle() method. It transforms HTTPRequest object into an Observable<HttpEvents>.

next: HttpHandler object represents the next interceptor in the chain of interceptors. The final ‘next’ in the chain is the Angular HttpClient.

This client will work well with the back-end in the posts:
Spring Boot JWT Authentication with Spring Security & MySQL
Spring Boot JWT Authentication with Spring Security & PostgreSQL
Spring Boot JWT Authentication with Spring Security & MongoDB


Note: If you use this front-end app for Node.js Express back-end in one of these tutorials:
Node.js + MySQL: JWT Authentication & Authorization
Node.js + PostgreSQL: JWT Authentication & Authorization
Node.js + MongoDB: User Authentication & Authorization with JWT

Please use x-access-token header like this:

...
const TOKEN_HEADER_KEY = 'x-access-token';

@Injectable()
export class AuthInterceptor implements HttpInterceptor {
  ...
  intercept(req: HttpRequest, next: HttpHandler): Observable<HttpEvent<any>> {
    ...
    if (token != null) {
      authReq = req.clone({ headers: req.headers.set(TOKEN_HEADER_KEY, token) });
    }
    return next.handle(authReq);
  }
}
...

Add Bootstrap to Angular project

Open index.html and import Bootstrap inside <head /> tag.

<!DOCTYPE html>
<html lang="en">
  <head>
    ...
    <link
      rel="stylesheet"
      href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css"
      integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh"
      crossorigin="anonymous"
    />
  </head>
  <body>
    <app-root></app-root>
  </body>
</html>

Create Components for Authentication

Register Component

This component binds form data (username, email, password) from template to AuthService.register() method that returns an Observable object.

register/register.component.ts

import { Component, OnInit } from '@angular/core';
import { AuthService } from '../_services/auth.service';

@Component({
  selector: 'app-register',
  templateUrl: './register.component.html',
  styleUrls: ['./register.component.css']
})
export class RegisterComponent implements OnInit {
  form: any = {
    username: null,
    email: null,
    password: null
  };
  isSuccessful = false;
  isSignUpFailed = false;
  errorMessage = '';

  constructor(private authService: AuthService) { }

  ngOnInit(): void {
  }

  onSubmit(): void {
    const { username, email, password } = this.form;

    this.authService.register(username, email, password).subscribe(
      data => {
        console.log(data);
        this.isSuccessful = true;
        this.isSignUpFailed = false;
      },
      err => {
        this.errorMessage = err.error.message;
        this.isSignUpFailed = true;
      }
    );
  }
}

We use Form Validation in the template:

  • username: required, minLength=3, maxLength=20
  • email: required, email format
  • password: required, minLength=6

register/register.component.html

<div class="col-md-12">
  <div class="card card-container">
    <img
      id="profile-img"
      src="//ssl.gstatic.com/accounts/ui/avatar_2x.png"
      class="profile-img-card"
    />
    <form
      *ngIf="!isSuccessful"
      name="form"
      (ngSubmit)="f.form.valid && onSubmit()"
      #f="ngForm"
      novalidate
    >
      <div class="form-group">
        <label for="username">Username</label>
        <input
          type="text"
          class="form-control"
          name="username"
          [(ngModel)]="form.username"
          required
          minlength="3"
          maxlength="20"
          #username="ngModel"
        />
        <div class="alert-danger" *ngIf="username.errors && f.submitted">
          <div *ngIf="username.errors.required">Username is required</div>
          <div *ngIf="username.errors.minlength">
            Username must be at least 3 characters
          </div>
          <div *ngIf="username.errors.maxlength">
            Username must be at most 20 characters
          </div>
        </div>
      </div>
      <div class="form-group">
        <label for="email">Email</label>
        <input
          type="email"
          class="form-control"
          name="email"
          [(ngModel)]="form.email"
          required
          email
          #email="ngModel"
        />
        <div class="alert-danger" *ngIf="email.errors && f.submitted">
          <div *ngIf="email.errors.required">Email is required</div>
          <div *ngIf="email.errors.email">
            Email must be a valid email address
          </div>
        </div>
      </div>
      <div class="form-group">
        <label for="password">Password</label>
        <input
          type="password"
          class="form-control"
          name="password"
          [(ngModel)]="form.password"
          required
          minlength="6"
          #password="ngModel"
        />
        <div class="alert-danger" *ngIf="password.errors && f.submitted">
          <div *ngIf="password.errors.required">Password is required</div>
          <div *ngIf="password.errors.minlength">
            Password must be at least 6 characters
          </div>
        </div>
      </div>
      <div class="form-group">
        <button class="btn btn-primary btn-block">Sign Up</button>
      </div>

      <div class="alert alert-warning" *ngIf="f.submitted && isSignUpFailed">
        Signup failed!<br />{{ errorMessage }}
      </div>
    </form>

    <div class="alert alert-success" *ngIf="isSuccessful">
      Your registration is successful!
    </div>
  </div>
</div>

In the code above, we use Template Driven Form, you want to know more details about Reactive Form Validation, please visit:
Angular 12 Form Validation example (Reactive Forms)

Login Component

Login Component also uses AuthService to work with Observable object. Besides that, it calls TokenStorageService methods to check loggedIn status and save Token, User info to Session Storage.

login/login.component.ts

import { Component, OnInit } from '@angular/core';
import { AuthService } from '../_services/auth.service';
import { TokenStorageService } from '../_services/token-storage.service';

@Component({
  selector: 'app-login',
  templateUrl: './login.component.html',
  styleUrls: ['./login.component.css']
})
export class LoginComponent implements OnInit {
  form: any = {
    username: null,
    password: null
  };
  isLoggedIn = false;
  isLoginFailed = false;
  errorMessage = '';
  roles: string[] = [];

  constructor(private authService: AuthService, private tokenStorage: TokenStorageService) { }

  ngOnInit(): void {
    if (this.tokenStorage.getToken()) {
      this.isLoggedIn = true;
      this.roles = this.tokenStorage.getUser().roles;
    }
  }

  onSubmit(): void {
    const { username, password } = this.form;

    this.authService.login(username, password).subscribe(
      data => {
        this.tokenStorage.saveToken(data.accessToken);
        this.tokenStorage.saveUser(data);

        this.isLoginFailed = false;
        this.isLoggedIn = true;
        this.roles = this.tokenStorage.getUser().roles;
        this.reloadPage();
      },
      err => {
        this.errorMessage = err.error.message;
        this.isLoginFailed = true;
      }
    );
  }

  reloadPage(): void {
    window.location.reload();
  }
}

Here are what we validate in the form:

  • username: required
  • password: required, minLength=6

login/login.component.html

<div class="col-md-12">
  <div class="card card-container">
    <img
      id="profile-img"
      src="//ssl.gstatic.com/accounts/ui/avatar_2x.png"
      class="profile-img-card"
    />
    <form
      *ngIf="!isLoggedIn"
      name="form"
      (ngSubmit)="f.form.valid && onSubmit()"
      #f="ngForm"
      novalidate
    >
      <div class="form-group">
        <label for="username">Username</label>
        <input
          type="text"
          class="form-control"
          name="username"
          [(ngModel)]="form.username"
          required
          #username="ngModel"
        />
        <div
          class="alert alert-danger"
          role="alert"
          *ngIf="username.errors && f.submitted"
        >
          Username is required!
        </div>
      </div>
      <div class="form-group">
        <label for="password">Password</label>
        <input
          type="password"
          class="form-control"
          name="password"
          [(ngModel)]="form.password"
          required
          minlength="6"
          #password="ngModel"
        />
        <div
          class="alert alert-danger"
          role="alert"
          *ngIf="password.errors && f.submitted"
        >
          <div *ngIf="password.errors.required">Password is required</div>
          <div *ngIf="password.errors.minlength">
            Password must be at least 6 characters
          </div>
        </div>
      </div>
      <div class="form-group">
        <button class="btn btn-primary btn-block">
          Login
        </button>
      </div>
      <div class="form-group">
        <div
          class="alert alert-danger"
          role="alert"
          *ngIf="f.submitted && isLoginFailed"
        >
          Login failed: {{ errorMessage }}
        </div>
      </div>
    </form>

    <div class="alert alert-success" *ngIf="isLoggedIn">
      Logged in as {{ roles }}.
    </div>
  </div>
</div>

Profile Component

This Component gets current User from Storage using TokenStorageService and show information (username, token, email, roles).

profile/profile.component.ts

import { Component, OnInit } from '@angular/core';
import { TokenStorageService } from '../_services/token-storage.service';

@Component({
  selector: 'app-profile',
  templateUrl: './profile.component.html',
  styleUrls: ['./profile.component.css']
})
export class ProfileComponent implements OnInit {
  currentUser: any;

  constructor(private token: TokenStorageService) { }

  ngOnInit(): void {
    this.currentUser = this.token.getUser();
  }
}

profile/profile.component.html

<div class="container" *ngIf="currentUser; else loggedOut">
  <header class="jumbotron">
    <h3>
      <strong>{{ currentUser.username }}</strong> Profile
    </h3>
  </header>
  <p>
    <strong>Token:</strong>
    {{ currentUser.accessToken.substring(0, 20) }} ...
    {{ currentUser.accessToken.substr(currentUser.accessToken.length - 20) }}
  </p>
  <p>
    <strong>Email:</strong>
    {{ currentUser.email }}
  </p>
  <strong>Roles:</strong>
  <ul>
    <li *ngFor="let role of currentUser.roles">
      {{ role }}
    </li>
  </ul>
</div>

<ng-template #loggedOut>
  Please login.
</ng-template>

Create Role-based Components

Public Component

Our Home Component will use UserService to get public resources from back-end.

home/home.component.ts

import { Component, OnInit } from '@angular/core';
import { UserService } from '../_services/user.service';

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit {
  content?: string;

  constructor(private userService: UserService) { }

  ngOnInit(): void {
    this.userService.getPublicContent().subscribe(
      data => {
        this.content = data;
      },
      err => {
        this.content = JSON.parse(err.error).message;
      }
    );
  }
}

home/home.component.html

<div class="container">
  <header class="jumbotron">
    <p>{{ content }}</p>
  </header>
</div>

Protected Components

These Components are role-based. But authorization will be processed by back-end.
We only need to call UserService methods:

  • getUserBoard()
  • getModeratorBoard()
  • getAdminBoard()

Here is an example for BoardAdminComponent.
BoardModeratorComponent & BoardUserComponent are similar.

board-admin/board-admin.component.ts

import { Component, OnInit } from '@angular/core';
import { UserService } from '../_services/user.service';

@Component({
  selector: 'app-board-admin',
  templateUrl: './board-admin.component.html',
  styleUrls: ['./board-admin.component.css']
})
export class BoardAdminComponent implements OnInit {
  content?: string;

  constructor(private userService: UserService) { }

  ngOnInit(): void {
    this.userService.getAdminBoard().subscribe(
      data => {
        this.content = data;
      },
      err => {
        this.content = JSON.parse(err.error).message;
      }
    );
  }
}

board-admin/board-admin.component.html

<div class="container">
  <header class="jumbotron">
    <p>{{ content }}</p>
  </header>
</div>

App Routing Module

We configure the Routing for our Angular app in app-routing.module.ts.

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { RegisterComponent } from './register/register.component';
import { LoginComponent } from './login/login.component';
import { HomeComponent } from './home/home.component';
import { ProfileComponent } from './profile/profile.component';
import { BoardUserComponent } from './board-user/board-user.component';
import { BoardModeratorComponent } from './board-moderator/board-moderator.component';
import { BoardAdminComponent } from './board-admin/board-admin.component';

const routes: Routes = [
  { path: 'home', component: HomeComponent },
  { path: 'login', component: LoginComponent },
  { path: 'register', component: RegisterComponent },
  { path: 'profile', component: ProfileComponent },
  { path: 'user', component: BoardUserComponent },
  { path: 'mod', component: BoardModeratorComponent },
  { path: 'admin', component: BoardAdminComponent },
  { path: '', redirectTo: 'home', pathMatch: 'full' }
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Routes array is passed to the RouterModule.forRoot() method.
We’re gonna use <router-outlet></router-outlet> directive in the App Component where contains navbar and display Components (corresponding to routes) content.

App Component

This component is the root Component of our Angular application, it defines the root tag: <app-root></app-root> that we use in index.html.

app.component.ts

import { Component, OnInit } from '@angular/core';
import { TokenStorageService } from './_services/token-storage.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  private roles: string[] = [];
  isLoggedIn = false;
  showAdminBoard = false;
  showModeratorBoard = false;
  username?: string;

  constructor(private tokenStorageService: TokenStorageService) { }

  ngOnInit(): void {
    this.isLoggedIn = !!this.tokenStorageService.getToken();

    if (this.isLoggedIn) {
      const user = this.tokenStorageService.getUser();
      this.roles = user.roles;

      this.showAdminBoard = this.roles.includes('ROLE_ADMIN');
      this.showModeratorBoard = this.roles.includes('ROLE_MODERATOR');

      this.username = user.username;
    }
  }

  logout(): void {
    this.tokenStorageService.signOut();
    window.location.reload();
  }
}

First, we check isLoggedIn status using TokenStorageService, if it is true, we get user’s roles and set value for showAdminBoard & showModeratorBoard flag. They will control how template navbar displays its items.

The App Component template also has a Logout button link that call logout() method and reload the window.

app.component.html

<div id="app">
  <nav class="navbar navbar-expand navbar-dark bg-dark">
    <a href="#" class="navbar-brand">bezKoder</a>
    <ul class="navbar-nav mr-auto" routerLinkActive="active">
      <li class="nav-item">
        <a href="/home" class="nav-link" routerLink="home">Home </a>
      </li>
      <li class="nav-item" *ngIf="showAdminBoard">
        <a href="/admin" class="nav-link" routerLink="admin">Admin Board</a>
      </li>
      <li class="nav-item" *ngIf="showModeratorBoard">
        <a href="/mod" class="nav-link" routerLink="mod">Moderator Board</a>
      </li>
      <li class="nav-item">
        <a href="/user" class="nav-link" *ngIf="isLoggedIn" routerLink="user">User</a>
      </li>
    </ul>

    <ul class="navbar-nav ml-auto" *ngIf="!isLoggedIn">
      <li class="nav-item">
        <a href="/register" class="nav-link" routerLink="register">Sign Up</a>
      </li>
      <li class="nav-item">
        <a href="/login" class="nav-link" routerLink="login">Login</a>
      </li>
    </ul>

    <ul class="navbar-nav ml-auto" *ngIf="isLoggedIn">
      <li class="nav-item">
        <a href="/profile" class="nav-link" routerLink="profile">{{ username }}</a>
      </li>
      <li class="nav-item">
        <a href class="nav-link" (click)="logout()">LogOut</a>
      </li>
    </ul>
  </nav>

  <div class="container">
    <router-outlet></router-outlet>
  </div>
</div>

Run this Angular 12 App

You can run this App with command: ng serve.

This client will work well with the back-end in the posts:
Spring Boot JWT Authentication with Spring Security & MySQL
Spring Boot JWT Authentication with Spring Security & PostgreSQL
Spring Boot JWT Authentication with Spring Security & MongoDB

If you use this front-end app for Node.js Express back-end in one of these tutorials:
Node.js + MySQL: JWT Authentication & Authorization
Node.js + PostgreSQL: JWT Authentication & Authorization
Node.js + MongoDB: User Authentication & Authorization with JWT

It configures CORS for port 8081, so you have to run command: ng serve --port 8081 instead.

Conclusion

Today we’ve done so many things from setup Angular 12 Project to write Login and Registration Services, Components for Token based Authentication and Authorization with Web Api. I hope you understand the overall layers of our Angular application, and apply it in your project at ease. Now you can build a front-end app that supports JWT Authentication & Authorization with Angular 12, HttpInterceptor and Router.

For other Angular versions, please visit:
Angular 8 JWT Authentication example
Angular 10 JWT Authentication example
Angular 11 JWT Authentication example

Happy learning, see you again!

Further Reading

Fullstack:
Angular 12 + Spring Boot: JWT Authentication & Authorization example
Angular 12 + Node.js Express: JWT Authentication & Authorization example

Source Code

You can find the complete source code for this tutorial on Github.

8 thoughts to “Angular 12 Login and Registration example with JWT & Web Api”

  1. Thank you for your tutorials

    I have a little bit of a different setup

    I am displaying the application based on someone already authenticated (from a different app, then routed to my application). I am consuming a token and displaying an appropriate page based on their credentials

    If possible could you show how to consume this token and display a admin page or user type page?

    Thank you in advance
    Rob

  2. Hello Bezcoder,
    I have tried your tutorial on my application for my schoolproject I thank you for that, it’s work but now I can’t get my API Rest it’s answer :
    Access to XMLHttpRequest at ‘http://localhost:8080/tournaments/1’ from origin ‘http://localhost:4200’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.
    I would like to know how can I resolve it please.

    it’ s the same for method post and put.
    but I just can get a list of tournaments at ‘http://localhost:8080/tournaments’

    Thank’s for all,
    Ludovic, a french student.

    1. Hi, you need to run your Angular client at port 8081 for passing CORS policy.
      The command is: ng serve --port 8081.

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