getTemperature.js

const lat = '56.937783';
const lon = '12.384565899999984';
const url = `https://api.met.no/weatherapi/locationforecastlts/1.3/?lat=${lat}&lon=${lon}`;

fetch(url)
  .then(response => {
    console.log('response', response);
    console.log('response.status:', response.status);
    console.log('response.statusText:', response.statusText);
    console.log('response.ok:', response.ok);
    return response.text();
  })
  .then(responseBody => (new window.DOMParser()).parseFromString(responseBody, "text/xml"))
  .then(responseBody => {
    let resp = responseBody.getElementsByTagName('temperature')[0].getAttribute("value");
    // console.log('responseBody:', responseBody);
    console.log('resp:', resp);
  });