Angular Source Code Demo 2

angular-demo2.ts

import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router } from '@angular/router';
import { Observable } from 'rxjs';
import { CanActivate } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class AuthGuard implements CanActivate  {

  constructor(private router: Router) {

  }

  canActivate(next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): boolean {

    if (localStorage.getItem('token') != null) {
      return true;
    } else {
      this.router.navigateByUrl('/login');
      return false;
    }
  }
}