Download all media of an Instagram post in new tabs (windows). (NOTE: Only works on direct post page links, not "lightboxed" posts from profile pages)

instagram-download-all-post-media.js

(function (scope) {
    /* NOTE: Comments are all in "block" form for easier bookmark one-lining */

    let download = async function (url) {
        const filename = (new URL(url)).pathname.split("/").pop();

        const fetched = await fetch(url);

        const tempElement = document.createElement("a");
        tempElement.target = "_blank";
        tempElement.download = filename;
        tempElement.href = URL.createObjectURL(await fetched.blob());
        tempElement.click();

        delete tempElement;
    };

    /* Public pages will hold their entry data here */
    let entries = scope._sharedData.entry_data.PostPage;

    /* If the data doesn't exist there... */
    if (entries[0].graphql === undefined) {
        /* Logged in pages will have the data stored in a different location */
        entries = Object.values(scope.__additionalData).map(x => x.data);
    }

    for (let entry of entries) {
        let entryMedia = entry.graphql.shortcode_media;

        if (entryMedia.edge_sidecar_to_children) {
            for (let edge of entryMedia.edge_sidecar_to_children.edges) {
                download(edge.node.display_url);
            }
        } else {
            download(entryMedia.display_url);
        }
    }
})(window);