External module "Verify"

import { Json, isIJsonObject } from '@ef-carbon/fetch';
import { fetcher, Verify } from '@ef-carbon/fetcher';

interface IData {
  name: string;
}

function isIData(json: Json): json is IData {
  return isIJsonObject(json) && typeof json.name === 'string';
}

const verify: Verify<IData> = isIData;

// expected payload `{ "name": "Rick Sanchez" }`
const response = await fetcher('http://endpoint.com/data.json');

const data = response.json(verify);  // verification
console.log(data.name);