Rotten Tomatoes Links for Jellyfin user script (my instance).

rotten_tomatoes_links_for_jellyfin-2025-09-07.user.js

// ==UserScript==
// @name         Rotten Tomatoes Links for Jellyfin
// @namespace    https://github.com/stpettersens
// @version      2025-11-12
// @description  This script adds a Rotten Tomatoes link for TV and movies on Jellyfin.
// @author       Sam Saint-Pettersen
// @match        https://jellyfin.mmedia.stpettersen.xyz/*
// @icon         https://www.rottentomatoes.com/assets/pizza-pie/images/favicon.ico
// @grant        none
// @run-at       document-start
// ==/UserScript==

'use strict';

// Replace @match (+ /*) and BaseURL with your Jellyfin server URL.
const BaseURL = "https://jellyfin.mmedia.stpettersen.xyz";

(function() {
    function waitForElement(selector, targetNode = document.body) {
        return new Promise((resolve) => {
            const element = document.querySelector(selector);
            if (element) {
                return resolve(element);
            }

            const observer = new MutationObserver(() => {
            const foundElement = document.querySelector(selector);
            if (foundElement) {
                observer.disconnect();
                resolve(foundElement);
            }
    });

    observer.observe(targetNode, {
      childList: true,
      subtree: true
    });
  });
}

function stripBdiTag(html) {
    return html.replace(/<bdi[^>]*>|<\/bdi>/gi, "");
}

function stripBrackets(html) {
    return html.replace('(', '').replace(')', '');
}

function injectRTLink() {
    let targetEl = null;
    let links = document.getElementsByClassName('button-link')
    for (let i = 0; i < links.length; i++) {
        if (links[i].href.startsWith("https://www.themoviedb.org")) {
            targetEl = links[i];
            break;
        }
        if (targetEl != null) {
            break;
        }
    }
    let medium = "m"; // m=movies, tv=television.
    let year = "";
    let title = stripBdiTag(stripBrackets(document.getElementsByTagName("h1")[0].innerHTML)).toLowerCase()
    .replace("/", "").replace(/ /g,"_").replace(/'/g,"").replace(/_&amp;/g, "_and")
    .replace(/:/g, "").replace(/,/g, "").replace(/-/g, "_").replace(/\./g, "");
    let otm = document.getElementsByClassName("originalTitle")[0];
    if (otm) {
        let ot = document.getElementsByClassName("originalTitle")[0].innerHTML;
        if (ot.length > 0) year = "_" + ot;
        if (ot.indexOf("-") != -1) {
            year = "";
            title = ot + title.replace("the", "");
        }
        if (ot.indexOf("!") != -1) {
            year = "";
            title = title.replace(ot.substring(1), "").replace("_", "");
        }
    }
    let ott = document.getElementsByClassName("originalTitle")[0];
    if (ott) {
        let ot = document.getElementsByClassName("originalTitle")[0].innerHTML;
        if (ot.indexOf("!RT") != -1) return; // If tagged !RT, there is no Rotten Tomatoes entry for the title.
        if (ot == "TV") medium = "tv";
    }

    let template = `, <a id="rt-link" target="_blank" class="button-link emby-button" href="https://www.rottentomatoes.com/${medium}/${title}${year}">Rotten Tomatoes</a>`;

    if (title.indexOf("nothing_here") != -1) {
        window.location.reload();
    }

    console.log(template);
    targetEl.insertAdjacentHTML("afterEnd", template.replace('_TV', ''));
}

let done = false;

waitForElement('.button-link').then(element => {
    if (!done) {
        injectRTLink();
        done = true;
    }
});

waitForElement('.headerHomeButton').then(element => {
    let homeBtn = document.getElementsByClassName("headerHomeButton")[0]
    homeBtn.addEventListener('click', (event) => {
        event.preventDefault();
        window.location = BaseURL;
    });
});

waitForElement('.headerButtonLeft').then(element => {
    let backBtn = document.getElementsByClassName("headerButtonLeft")[0];
    backBtn.addEventListener('click', (event) => {
        event.preventDefault();
        window.location = BaseURL;
    });
});

window.navigation.addEventListener("navigate", (event) => {
    waitForElement('.button-link').then(element => {
        if (!done) {
            injectRTLink();
            done = true;
        }
    });

    waitForElement('.headerHomeButton').then(element => {
        let homeBtn = document.getElementsByClassName("headerHomeButton")[0]
        homeBtn.addEventListener('click', (event) => {
            event.preventDefault();
            window.location = BaseURL;
        });
    });

    waitForElement('.headerButtonLeft').then(element => {
        let backBtn = document.getElementsByClassName("headerButtonLeft")[0];
        backBtn.addEventListener('click', (event) => {
            event.preventDefault();
            window.location = BaseURL;
        });
    });
});
})();