Using promises to get all playlists of a spotify user with one function (requires spotify-web-api-node)

getPlaylists.js

const SpotifyWebApi = require("spotify-web-api-node");

const spotifyApi = new SpotifyWebApi();

spotifyApi.setAccessToken(process.env.ACCESS_TOKEN);

const getPlaylists = function (userId, offset = 0, limit = 50, lists = []) {
  console.log("offset", offset);
  return new Promise((resolve, reject) =>
    spotifyApi
      .getUserPlaylists(userId, { offset, limit })
      .then((data) => {
        if (data.body.items.length > 0) {
          const items = data.body.items.map(function (item) {
            return { name: item.name, id: item.id };
          });
          lists = lists.concat(items);
          getPlaylists(userId, offset + limit, limit, lists)
            .then(resolve)
            .catch(reject);
        } else {
          resolve(lists);
        }
      })
      .catch(reject)
  );
};

spotifyApi.getMe().then(
  function (data) {
    getPlaylists(data.body.id).then(function (items) {
      console.log(items);
    });
  },
  function (err) {
    console.error(err);
  }
);