Gillis Werrebrouck Gillis Werrebrouck - 28 days ago 8
Node.js Question

How can I get a list of playlists by user with the spotify web api?

I'm working on a project and I would like to get a list of all the playlists of the logged in user on spotify. Currently I can loggin and see user info (by following the demo on spotify). Now I want to get the playlists of the user that is logged in and that is where I'm stuck.

This is the code I have:

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

var express = require('express'); // Express web server framework
var request = require('request'); // "Request" library
var querystring = require('querystring');
var cookieParser = require('cookie-parser');

var client_id = '2e54c888b964418588d8c274d2b9dd5e'; // Your client id
var client_secret = 'c7b15e90a3cb4891b3dbcd79ed8bcfa0'; // Your secret
var redirect_uri = 'http://localhost:8888/callback'; // Your redirect uri

/**
* Generates a random string containing numbers and letters
* @param {number} length The length of the string
* @return {string} The generated string
*/
var generateRandomString = function(length) {
var text = '';
var possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';

for (var i = 0; i < length; i++) {
text += possible.charAt(Math.floor(Math.random() * possible.length));
}
return text;
};

var stateKey = 'spotify_auth_state';

var app = express();

app.use(express.static(__dirname + '/public'))
.use(cookieParser());

app.get('/login', function(req, res) {
var state = generateRandomString(16);
res.cookie(stateKey, state);

// your application requests authorization
var scope = 'user-read-private user-read-email';
res.redirect('https://accounts.spotify.com/authorize?' +
querystring.stringify({
response_type: 'code',
client_id: client_id,
scope: scope,
redirect_uri: redirect_uri,
state: state
}));
});

app.get('/playlists', function(req, res) {
// your application requests authorization
var scope = 'playlist-read-private';
res.redirect('https://api.spotify.com/v1/me/playlists');
});

app.get('/callback', function(req, res) {

// your application requests refresh and access tokens
// after checking the state parameter

var code = req.query.code || null;
var state = req.query.state || null;
var storedState = req.cookies ? req.cookies[stateKey] : null;

if (state === null || state !== storedState) {
res.redirect('/#' +
querystring.stringify({
error: 'state_mismatch'
}));
} else {
res.clearCookie(stateKey);
var authOptions = {
url: 'https://accounts.spotify.com/api/token',
form: {
code: code,
redirect_uri: redirect_uri,
grant_type: 'authorization_code'
},
headers: {
'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64'))
},
json: true
};

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

var access_token = body.access_token,
refresh_token = body.refresh_token;

var options = {
url: 'https://api.spotify.com/v1/me',
headers: { 'Authorization': 'Bearer ' + access_token },
json: true
};

// use the access token to access the Spotify Web API
request.get(options, function(error, response, body) {
console.log(body);
});

// we can also pass the token to the browser to make requests from there
res.redirect('/#' +
querystring.stringify({
access_token: access_token,
refresh_token: refresh_token
}));
} else {
res.redirect('/#' +
querystring.stringify({
error: 'invalid_token'
}));
}
});
}
});

app.get('/refresh_token', function(req, res) {

// requesting access token from refresh token
var refresh_token = req.query.refresh_token;
var authOptions = {
url: 'https://accounts.spotify.com/api/token',
headers: { 'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64')) },
form: {
grant_type: 'refresh_token',
refresh_token: refresh_token
},
json: true
};

request.post(authOptions, function(error, response, body) {
if (!error && response.statusCode === 200) {
var access_token = body.access_token;
res.send({
'access_token': access_token
});
}
});
});

console.log('Listening on 8888');
app.listen(8888);


The lines with:

app.get('/playlists', function(req, res) {
// your application requests authorization
var scope = 'playlist-read-private';
res.redirect('https://api.spotify.com/v1/me/playlists');
});


are the ones I wrote myself but I don't know how I can make it work.

Answer

Spotify API playlists endpoint requires authentication token.

Very primitive example, in those lines you can get Auth Token:

  // use the access token to access the Spotify Web API
    request.get(options, function(error, response, body) {
      console.log(body);
      token = access_token;
    });

Then, your code for getting playlists:

var token = '';                                                                                                                                                                                                                           

app.get('/playlists', function(req, res) {
  var state = generateRandomString(16);
  res.cookie(stateKey, state);
  // your application requests authorization
  var scope = 'playlist-read-private';
  res.redirect('https://api.spotify.com/v1/me/playlists?' +
    querystring.stringify({
      access_token: token,
      token_type: 'Bearer',
      response_type: 'code',
      client_id: client_id,
      scope: scope,
      redirect_uri: redirect_uri,
      state: state
   }));
});

First, you visiting 'http://localhost:8888/login` for authentification, then, you going to 'http://localhost:8888/playlists' for playlists.