why use an axios instance code example

Example: axios instance

// lets you create custom pre-configured fetch api call!
const getUser = axios.create({
  baseURL: 'https://randomuser.me/api/', // we define url
  timeout: 1000, // (optional) set timeout
  headers: {'X-Custom-Header': 'foobar'} // pass headers
});

// use later like this
getUser().then(response => console.log(response))