fetch-example-2.js

const config = {
  method: 'POST',
  body: JSON.stringify({ cat: 'grumpy' }),
  cache: 'no-cache',
  mode: 'no-cors',
}

fetch('http://localhost:8080/cats?categ=10&type=5', config)
.then(response => {
  if(response.ok) {
    return response.json();
  }
})
.then(data => {
  console.log(data);
})
.catch(err => {
  console.log(err.message);
});