How do I use fetch?

const url = 'https://swapi.co/api/people/5'

const onValidate = (response) => {
  const { status, statusText } = response
  if (status < 200) throw Error(statusText)
  if (status > 299) throw Error(statusText)
  return response.json()
}

const onSuccess = (json) => {
  console.log(`success: ${JSON.stringify(json)}`)
}

const onFailure = (error) => {
  console.error(`error: ${error}`)
}

fetch(url)
    .then(onValidate)
    .then(onSuccess)
    .catch(onFailure)