Check JSON result at login with Angular 2x

My service to enter has:

enter (date: any): Observable {
console.log (data.email, data.senha);
(& # 39; $ {this.baseUrl} / `+ & # 39 ;? email = & # 39; +` $ {date.email} `+ & # 39; & password = & # 39; +` $ { date.senha} `);
}

And my "login" component the input button has:

()
this.jogadorService.entrar (this.user)
.subscribe (() => {
this.jogadorService.entrar (this.user);
alert (& # 39; Login made & # 39;);
//this.router.navigate (['/login'])
});
}

But he accepts any data. I wanted to check if the username and password exist and are the same. And if the empty JSON comes back {} Then show the message.

How can I do?

Taking advantage of the enthusiasm, if the result is correct, store the result in the LocalStorage.