Print GitHub release download count per each release found on the "Releases" page.

github-release-download-counter.js

let getReleaseTag = () => {
    let url = document.URL;
    const delim = '/releases/tag/';
    if (url.includes(delim)) {
        return url.split(delim)[1];
    }
};

var xmlHttp = new XMLHttpRequest();
xmlHttp.onreadystatechange = function () {
    switch (xmlHttp.readyState) {
        case 0: // UNINITIALIZED
        case 1: // LOADING
        case 2: // LOADED
        case 3: // INTERACTIVE
            break;
        case 4: // COMPLETED
            const releases = JSON.parse(xmlHttp.responseText);
            const tag = getReleaseTag();
            for (var i in releases) {
                for (var j in releases[i].assets) {
                    if (tag && releases[i].tag_name != tag) {
                        continue
                    }
                    console.log(releases[i].assets[j].download_count,
                        decodeURI(releases[i].assets[j].name));
                }
            }
            break;
        default:
            console.error('GitHub API request failed.');
    }
};
let setOriginToAPIUrl = (loc) => loc.replace('//github.com', '//api.github.com/repos');
let url = document.URL;
let base = window.location.pathname.split("/");
let owner = base[1];
let repo = base[2];
url = [setOriginToAPIUrl(window.location.origin), owner, repo, "releases"];
xmlHttp.open('GET', url.join("/"), true);
xmlHttp.send(null);