fetchExample.js

function makefetchCall() {
  fetch('...', {...})
    .then(res => {
      if (!res.ok) {
        throw Error({ message: 'Response with error', code: res.status })  
      }

      return res.json()
    })
    .then(json => {
      console.log(json)
    })
    .catch(e => {
      if (e.code) {
        // Means you got a response with error status code
      } else {
        // There was no response due to invalid url or no internet connection or ......
      }
    })
}