const options = {method: 'DELETE'};

fetch('http://localhost:4065/v1/kubernetes/cluster-templates/{namespace}/{name}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "success": true,
  "data": {
    "deleted": true
  },
  "meta": {
    "requestId": "<string>",
    "timestamp": "<string>"
  }
}