// boilerplate code necessary to create a POST request using the fetch()

postRequest-fetch.js

//The boilerplate code for an AJAX POST request using fetch.

fetch('https://api-to-call.com/endpoint', {
  method: 'POST',
  body: JSON.stringify({id: '200'})
}).then( response => {
  if (response.ok) {
    return response.json();
  }
  throw new Error('Request failed!');
}, networkError => {
  console.log(networkError.message);
}).then( jsonResponse => {
  return jsonResponse;
});