How can I implement JWT authentication in my Angular app?

How can I implement JWT authentication in my Angular app?

To implement JWT authentication in your Angular app, you need to follow these steps: 1. Set up a backend server to issue JWTs. 2. Create a login form in your Angular app. 3. Send the user's credentials to the backend and receive a JWT. 4. Store the JWT in local storage or a cookie. 5. Use an HTTP interceptor to attach the JWT to outgoing requests.

What libraries do I need to use for JWT in Angular?

You can use libraries like @auth0/angular-jwt to help manage JWTs in your Angular application. This library provides utilities to decode and manage JWTs easily.

How do I protect routes in my Angular app using JWT?

To protect routes, you can create a route guard that checks if the user is authenticated by verifying the presence of a valid JWT. If the JWT is not present or invalid, redirect the user to the login page.

Can you show me an example of a route guard?

Sure! Here's a simple example of a route guard:

import { Injectable } from '@angular/core';
import { CanActivate, Router } from '@angular/router';
import { AuthService } from './auth.service';

@Injectable({ providedIn: 'root' })
export class AuthGuard implements CanActivate {
  constructor(private authService: AuthService, private router: Router) {}

  canActivate(): boolean {
    if (this.authService.isLoggedIn()) {
      return true;
    }
    this.router.navigate(['/login']);
    return false;
  }
}