fetch-helpers.js

export function parseJSON(response) {
  return response.json()
}

export function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response
  } else {
    const error = new Error(response.statusText)
    error.response = response
    throw error
  }
}

export function fetchJSON(url, options = {}) {
  const opts = {
    ...options,
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json'
    }
  }
  return fetch(url, opts).then(checkStatus).then(parseJSON)
}

export function getJSON(url, options) {
  return fetchJSON(url, options)
}