TypeError: res.json is not a function

@barreola wrote:

Why is not a function? I’ve read this but I cannot make it work for my project, the error is shown in the following code

getListVideos(listId) {
    return this.http.get('https://www.googleapis.com/youtube/v3/playlistItems?key=' + this.apiKey + '&playlistId=' + listId +'&part=snippet,id&maxResults=20')
    .map((res: Response) => {
      return res.json()['items'];
    })
  }```

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