How to fetch data from response._body in proper way?

So starting first my nodejs server sends this as a response

"["name1","name2","name3"]"

but my angular 2 code for service is

return this.http.get(this.config.apiUrl + '/folder').map((response:Response)=> {
       response.json();
     console.log(response); }

How do I fetch the array?

if I use response._body there will be an error in npm start stating ._body undefined, So I make it as a comment then after npm start I reverse back, I know it is not proper way. Here is the console.log of above service code

 Response
 headers: Headers
 ok:true
 status:200
 statusText:"OK"
 type:2
 url:"http://localhost:4000/folder"
 _body:"["name1","name2","name3"]"
 __proto__:Body

The main problem is to fetch in component in an array

Here, is the code I am trying

this.photoService.getAllfolder().subscribe(
data => {
  console.log(data);
},
error => {
      console.log(error);
});

please I am stuck with it for 3 days and it's urgent.

via siddharth ranjan