Implement authentication and authorization in an Angular application?
- Create an authentication service: Create a service that handles user authentication. This service should interact with the backend API to verify user credentials, manage user sessions, and retrieve user information. You can use the built-in Angular HTTPClient module to make HTTP requests to the backend API.
- Implement routing: Use the Angular Router to handle navigation within the application. Define routes for each page or component in the application and implement guards to restrict access to certain routes based on the user’s authentication status.
- Implement guards: Implement guards to restrict access to certain routes based on the user’s authentication status. Angular provides several types of guards, including CanActivate, CanActivateChild, CanDeactivate, and CanLoad. You can use these guards to restrict access to certain routes, or to redirect users to a login page if they are not authenticated.
- Use tokens for authorization: Use JSON Web Tokens (JWT) to implement authorization in your application. When a user logs in, your authentication service should generate a JWT and return it to the client. The client can then include this token in subsequent API requests to authenticate the user and authorize access to protected resources.
- Store tokens securely: Store JWTs securely on the client side. Angular provides several options for storing tokens, including local storage, session storage, and cookies. Choose the option that best fits your use case and ensure that the token is stored securely.
- Protect API endpoints: Implement authentication and authorization on the backend API to protect resources that require authentication. Verify the JWT provided by the client and restrict access to protected resources based on the user’s authorization level.