Downloads Instagram follower list as CSV format.

instargram-follower-donwload.js

(() => {
    let req = new XMLHttpRequest(),
        page = _sharedData.entry_data.ProfilePage,
        user = page[page.length-1].graphql.user,
        url = `/graphql/query/?query_hash=37479f2b8209594dde7facb0d904896a&variables={"id":"${user.id}","first":${user.edge_followed_by.count}}`;

    if (!confirm(`${user.full_name}?`))
        return;

    req.onloadend = () => {
        if (req.status != 200)
            return alert('too many follower!')
        let contents = 'Username,Full Name,Pic,Id\n';
        JSON.parse(req.response).data.user.edge_followed_by.edges.forEach(({ node }) => {
            contents += `"${node.username}","${node.full_name}","${node.profile_pic_url}","${node.id}"\n`;
        });
        let a = document.createElement("a");
        document.body.appendChild(a);
        a.style = "display: none";
        a.href = window.URL.createObjectURL(new Blob([contents], {type: "octet/stream"}));
        a.download = `${user.full_name}-follower.csv`;
        a.click();
        window.URL.revokeObjectURL(a.href);
    };
    req.open('GET', url);
    req.send();
})();