If i save data in service it is saved not a problem

Hey Dear,

Angular is not provide direct way to store data in session. You can use Observable or Map.

Create A services like this:-

home.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { map } from 'rxjs/operators';
@Injectable()
export class AuthenticationService {
constructor(private http: HttpClient) { }
login(username: string, password: string) {
return this.http.post(`/users/authenticate`, { username: username, password: password })
.pipe(map(user => {
// login successful if there's a jwt token in the response
if (user && user.token) {
// store user details and jwt token in local storage to keep user logged in between page refreshes
localStorage.setItem('currentUser', JSON.stringify(user));
}
return user;
}));
}
logout() {
// remove user from local storage to log user out
localStorage.removeItem('currentUser');
}
}

learn more about localStorage in Angular follow this link

https://medium.com/@cyrilletuzi/angular-2-async-local-storage-fd8609fa84e0

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