const options = {method: 'GET'};

fetch('http://localhost:4065/v1/kubernetes/namespaces', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "success": true,
  "data": {
    "items": [
      {}
    ],
    "continueToken": "<string>"
  },
  "meta": {
    "requestId": "<string>",
    "timestamp": "<string>"
  }
}