[Nexus]

CityZen, попробуйте так

"use strict";

var url = 'https://samples.openweathermap.org/data/2.5/weather?q=London,uk&appid=b6907d289e10d714a6e88b30761fae22';
var myInit = {
    method: 'GET',
    headers: myHeaders,
    cache: 'default'
};
var myHeaders = {
    "Content-Type": "application/json"
};


const getData = () => {
    return fetch(url, myInit).catch(function(err) {
        console.log('Fetch Error :-S', err);
    });
};

getData().then(console.log);