Function fetchJSON

index.js:11–31

(url)

}

function fetchJSON (url) {
  if (apiKey !== '') {
    if (url.indexOf('?') > -1) {
      url += '&api_key='
    } else {
      url += '?api_key='
    }
    url += apiKey
  }
  return fetch(url)
    .then(res => {
      if (!res.ok) {
        throw new Error(`${res.status} ${res.statusText}`)
      }
      return res.json()
    })
    .then(body => {
      if (body.Response === 'Error') throw body.Message
      return body
    })
}

function coinList () {
  const url = `${baseUrl}all/coinlist`