fetch() GET request

fetch('https://api-to-call.com/endpoint')  //first argument determines the endpoint of the request.
.then(response => {  //.then() will fire only after the promise status of fetch() has been resolved.
  if (response.ok){
    return response.json();   //Testing the ok property of the response object that it will be a Boolean value. If there were no errors, response.ok will be true and the code will return
  }
  throw new Error('Request failed!');  //code will throw this error when response.ok is falsy.
}, networkError => {
  console.log(networkError.message);   //If we could not reach the endpoint at all, e.g., the server is down, then we would get this networkError.
}).then(jsonResponse => {  //The second .then()‘s success callback won’t run until the previous .then() method has finished running. It will also not run if there was an error was thrown previously.
  return jsonResponse;
}
);