spotify-client-app.js

/**
 * This is an example of a basic node.js script that performs
 * the Client Credentials oAuth2 flow to authenticate against
 * the Spotify Accounts.
 *
 * For more information, read
 * https://developer.spotify.com/web-api/authorization-guide/#client_credentials_flow
 */

var request = require('request'); // "Request" library

var client_id = 'xxx'; // Your client id
var client_secret = 'xxx'; // Your secret

// your application requests authorization
var authOptions = {
  url: 'https://accounts.spotify.com/api/token',
  headers: {
    'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64'))
  },
  form: {
    grant_type: 'client_credentials'
  },
  json: true
};

const playlistId = 'xxx';

request.post(authOptions, function(error, response, body) {
  if (!error && response.statusCode === 200) {

    // use the access token to access the Spotify Web API
    var token = body.access_token;

    displayPlaylistTracks(playlistId, token, 0, 100, [], items => {
      
      items.forEach(item => {
        let artists = item.track.artists.map(a => a.name).join(", ");
        let track = item.track.name;
        console.log(artists + " - " + track);
      });

      console.log("\ntoken: " + token);

    });
  }
});

function displayPlaylistTracks(playlistId, token, offset, limit, items, callback) {

  //console.log("offset " + offset);      

  var options = {
    url: 'https://api.spotify.com/v1/playlists/' + playlistId + '/tracks?offset=' + offset + '&limit=' + limit,
    headers: {
      'Authorization': 'Bearer ' + token
    },
    json: true
  };
  
  request.get(options, function(error, response, body) {

    //console.log("found " + body.items.length);

    body.items.forEach(item => {
        items.push(item);
    });

    if (body.items.length === limit) {
      displayPlaylistTracks(playlistId, token, offset+limit, limit, items, callback);
    } else {
      callback(items);
    }

  });

}