Authentication Ionic + Laravel

The easiest thing to do is to use this package https://github.com/auth0/angular2-jwt

It will automatically send your token and authorization header along with requests if you use this.authHttp.get and it has lots of helper functions like isTokenExpired()

If you want to do it like you have it, it would be something like this

let headers = new Headers({ 'Authorization': 'Bearer ' + window.localStorage.getItem('token') });
let options = new RequestOptions({ headers: headers });
return this.http.get(this.api+'causes', options).map( res => res.json());

I'm not sure what you are asking in the second question