JSFiddle - React, Tailwind, and code Playground

JavaScript

var taskSet = [
            {nr:1, name: "one", url: "https://api.flickr.com/services/rest/?method=flickr.photosets.getPhotos&api_key=16ef420c60f8899b3617e773b56508ee&photoset_id=72157644400632823&format=json&nojsoncallback=1&api_sig=4607cf37743a2797c5da1735582c9ac6"}
            ,{nr:2, name: "zwo", url: "https://api.flickr.com/services/rest/?method=flickr.test.echo&api_key=1e4a63d700064d6eba2bca1aeefdd842&format=json&&nojsoncallback=1"}
            ,{nr:3, name: "zwo", url: "https://api.flickr.com/services/rest/?method=flickr.test.echo&api_key=16ef420c60f8899b3617e773b56508ee&format=json&&nojsoncallback=1"}
        ];


        window.onload = function () {

            var tasks = [];

            taskSet.forEach(function (taskDef) {
                console.info("creating task for", taskDef.name);
                var p = new Promise(function(resolve, reject) {
                    getXhr(taskDef.url, function(data){
                        console.info(data);
                        resolve({task: taskDef, data: data});
                    }).send();
                });
                tasks.push(p);
            })


            Promise.all(tasks).then(function(value){
                console.log("Promise.all", value);
                var result = [];
                var output = document.createElement("ul");
                value.forEach(function(val){
                    result.push( val.data.type === 'load' ? val.data.target.response : val.data);
                    var li = document.createElement("li");
                    li.innerHTML = "Task: " + val.task.name + ", Result: " + result[result.length-1];
                    output.appendChild(li);
                })
                console.info("ALL DONE with result", result);
                document.documentElement.lastElementChild.appendChild(output);
            });
        };

        var getXhr = function(url, success, error) {
            console.info("build xhr");
            var xhr = new...