TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable

Question

I am trying to map from a service call but getting an error. Looked at subscribe is not defined in angular 2? and it said that in order to subscribe we need to

Answer 1

In your example code, you have your map operator receiving two callbacks, when it should only be receiving one. You can move your error handling code to your catch callback.

checkLogin():Observable{
    return this.service.getData()
                       .map(response => {  
                          this.data = response;                            
                          this.checkservice=true;
                          return true;
                       })
                       .catch(error => {
                          this.router.navigate(['newpage']);
                          console.log(error);
                          return Observable.throw(error);
                       })
   }

You'll need to also import the catch and throw operators.

import 'rxjs/add/operator/catch';
import 'rxjs/add/observable/throw';

EDIT: Note that by returning Observable.throwin your catch handler, you won't actually capture the error - it will still surface to the console.