How to use NowViewingItem in SessionInfoDto interface

[MathiasPetey]

Hi,

I was wondering how to use the NowViewingItem field in the SessionInfoDto interface ?

Basically, I want to access the information of the item being viewed by the Jellyfin user before starting an episode (e.g. I go to the Non Non Biyori page on Jellyfin to display information about the show, I want to find in real time the id of Non Non Biyori (6f5590620a1527ef4f16c611fd264f4d) using the typescript jellyfin sdk).

I can access all the information of the show while playing its episodes with NowPlayingItem, but I don't find how to extract this information from the show presentation page.

I thought it could have been with NowViewingItem but its content is always empty unless I manually report viewing a given item with the reportViewing method.

I don't have much knowledge in typescript (first time developping in ts/js actually), I hope my questions are understandable enough.

Bellow is the code I currently use.

Thanks

import { Jellyfin } from "@jellyfin/sdk/lib/jellyfin.js";
import { getSessionApi, getItemsApi, getUserApi, getSystemApi } from "@jellyfin/sdk/lib/utils/api/index.js";

const JELLYFIN_URL = "JELLYFIN_URL";
const USERNAME = "USERNAME";
const PASSWORD = "PASSWORD";

async function main() {
  // Créer le client Jellyfin
  const jellyfin = new Jellyfin({
    clientInfo: { name: "session_info_extractor", version: "1.0.0" },
    deviceInfo: { name: "PC", id: "session_info_extractor" },
  });

  // Créer une API sur le serveur
  const api = jellyfin.createApi(JELLYFIN_URL);

  // Authentification
  const auth = await getUserApi(api).authenticateUserByName({
    authenticateUserByName: { Username: USERNAME, Pw: PASSWORD },
  });

  if (!auth.data.AccessToken) throw new Error("Login failed");
  // Mettre à jour l'API avec le token
  api.accessToken = auth.data.AccessToken;

  console.log("Connecté à Jellyfin");
  
  let lastState = new Map<string, any>();
  async function checkSessions() {
    const sessions = await getSessionApi(api).getSessions();

    for (const s of sessions.data) {
      if (!s.Id) continue;
      const id = s.Id;
      const state = {
        series: s.NowPlayingItem?.SeriesName,
        episode: s.NowPlayingItem?.Name,
        paused: s.PlayState?.IsPaused,
        genres: s.NowViewingItem?.Genres,
        now_viewing_item: s.NowViewingItem?.Name, // always empty
      };

      const previous = lastState.get(id);

      if (JSON.stringify(previous) !== JSON.stringify(state)) {
        console.log("---- changement détecté ----");
        console.log("Utilisateur :", s.UserName ?? "N/A");
        console.log("Série :", state.series ?? "N/A");
        console.log("Episode :", state.episode ?? "N/A");
        console.log("Pause :", state.paused ?? "N/A");
        console.log("now_viewing_item :", state.now_viewing_item ?? "N/A");
        lastState.set(id, state);
      }
    }
  }

  setInterval(checkSessions, 500); 

}

main().catch(console.error);