Login and Signup with JWT authentication in Angular14

Angular is a popular framework for building single-page web applications. One common feature of web applications is the ability for users to create accounts and log in. In this article, we will discuss how to implement a simple login and signup feature in Angular using JWT authentication.

Login and Signup

First, we need to create a component for the login and signup forms. We can use Angular’s built-in forms module to handle the form data and validation. The forms module provides a convenient way to create and manage forms in Angular applications.

“`
import { Component } from ‘@angular/core’;

@Component({
selector: ‘app-login’,
templateUrl: ‘./login.component.html’,
styleUrls: [‘./login.component.css’]
})
export class LoginComponent {
// login form code here
}
“`

Once we have the login and signup components set up, we can use Angular’s router module to define the routes for the login and signup components. This will allow users to navigate to the login and signup pages by clicking on links or entering the URL in the browser address bar.

“`
const routes: Routes = [
{ path: ‘login’, component: LoginComponent },
{ path: ‘signup’, component: SignupComponent },
{ path: ”, redirectTo: ‘/login’, pathMatch: ‘full’ }
];
“`

JWT Authentication

JWT (JSON Web Token) authentication is a popular method for securing web applications. When a user logs in, the server generates a JWT token and sends it back to the client. The client then includes the token in the headers of subsequent requests to access protected resources.

In Angular, we can use the `HttpClient` module to send HTTP requests and attach the JWT token in the headers. This will allow us to authenticate and authorize the user’s requests on the server side.

“`
import { HttpClient, HttpHeaders } from ‘@angular/common/http’;

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

login(username: string, password: string) {
return this.http.post(‘/api/login’, { username, password })
.subscribe(data => {
// save the JWT token in local storage
localStorage.setItem(‘token’, data.token);
});
}

getAuthorizationHeader() {
const token = localStorage.getItem(‘token’);
return {
headers: new HttpHeaders({
‘Authorization’: `Bearer ${token}`
})
};
}

// other authentication methods here
}
“`

Conclusion

Implementing a simple login and signup feature with JWT authentication in Angular is a common task for web developers. By following the steps outlined in this article, you can create a secure and reliable authentication system for your Angular applications.