// By default fetch use GET method
fetch('<url_to_call>')
  .then(response => {
    if (response.state === 200) {
      response.json().then(data => {
        console.log(data);
      });
    } else {
      console.log('Server response error code');
    }
  })
  .catch(err => {
    console.error(err);
  })