Getting Spotify API access token from frontend JavaScript code

I have a web app that allows people to generate a list of songs by artists that are related to a particular artist. I want to be able to connect to the user's Spotify account and create a playlist for them from that list of songs, but I need to get an access token. I have a developer account and client ID and am trying to work through the Authorization Flow, but it's not working for me. Instead, I get this error: XMLHttpRequest cannot load https://accounts.spotify.com/authorize/?client_id=d137fe25b31c4f3ba9e29d85f…:3000/callback&scope=user-read-private%20user-read-email&state=34fFs29kd09. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://localhost:3000' is therefore not allowed access.

This is a portion of my scripts.js file (i'm using the spotify-web-api-js node module):

$('#spotify').on('click', function() {
    $.support.cors = true;
    $.getJSON("https://accounts.spotify.com/authorize/?client_id=d137fe25b31c4f3ba9e29d85f4e47c66&response_type=code&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&scope=user-read-private%20user-read-email&state=34fFs29kd09", function(json2){
    $.getJSON("https://accounts.spotify.com/api/token/?grant_type=authorization_code&code=" + json2.code + "&redirect_uri=http%3A%2F%2Flocalhost%3A3000%2Fcallback&client_id=d137fe25b31c4f3ba9e29d85f4e47c66&client_secret={...}", function(json3) {
      s.setAccessToken(json3.access_token);
      });
    });
  });
});

According to my research, it's a CORS-related issue. I'm making edits to my ExpressJS server to remedy this cross-origin problem and installed the cors node module, but I'm still getting the same error.

index.js server:

var express = require('express');
var cors = require('cors');
var app = express();
var port = 3000;

app.use(function(req, res, next) {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
  next();
});


 app.use(express.static(__dirname + '/public')); // looks in public directory, not root directory (protects files)

 app.get('/', function(req, res) {
     res.send(__dirname + '\\index.html')
});

app.listen(port, function() {
          console.log('CORS-enabled web server listening on port ' + port);
});

When I go to the URL in question directly through my browser, it gives me the expected "Do you authorize this app to use your Spotify information" form.

Should I require 'cors' in 'scripts.js' for it to work? Does anyone have any other suggestions?

Answers:

Answer

I believe the issue here is that you're attempting to retrieve JSON data from the endpoint where you should direct your users. So instead of making a request to it, you should supply a button on your page that links to your https://accounts.spotify.com/authorize/{...} URL. The user will proceed to give your application the permissions you've requested as specified in the scope parameter, and will be directed back to the URL you've specified in the redirect_uri parameter. This is where you get the authorization code, which you can use in the https://accounts.spotify.com/api/token/{...} endpoint. Read more about the Authorization Code flow in the Authorization Guide.

Spotify Web API support three different oAuth flows, and you might be interested in Implicit Grant. Examples of all of these flows written in Javascript using Node is available at https://github.com/spotify/web-api-auth-examples.

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