Hi Sander,
the service code is 
create(name: string): Promise<Hero> {
  return this.http
   .post(this.heroesUrl, JSON.stringify({name: name}), {headers: this.
headers})
   .toPromise()
   .then(res => res.json().data)
   .catch(this.handleError);
 } 

and you were right - it is the service code. I returned res.json().data 
when I should return res.json() and that now updates the code.
Many thanks for the help.
John


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