tokens.js

var SpotifyWebApi = require('spotify-web-api-node');
const express = require('express')


const scopes = [
    'ugc-image-upload',
    'user-read-playback-state',
    'user-modify-playback-state',
    'user-read-currently-playing',
    'streaming',
    'app-remote-control',
    'user-read-email',
    'user-read-private',
    'playlist-read-collaborative',
    'playlist-modify-public',
    'playlist-read-private',
    'playlist-modify-private',
    'user-library-modify',
    'user-library-read',
    'user-top-read',
    'user-read-playback-position',
    'user-read-recently-played',
    'user-follow-read',
    'user-follow-modify'
  ];
  

var spotifyApi = new SpotifyWebApi({
    clientId: '475065ad09b14f60a13da67ff08de3f0',
    clientSecret: 'c86ce757d0094f08883821a2d57444bd',
    redirectUri: 'http://localhost:8090/callback'
  });
  
  const app = express();
  
  app.get('/login', (req, res) => {
    res.redirect(spotifyApi.createAuthorizeURL(scopes));
  });
  
  app.get('/callback', (req, res) => {
    const error = req.query.error;
    const code = req.query.code;
    const state = req.query.state;
  
    if (error) {
      console.error('Callback Error:', error);
      res.send(`Callback Error: ${error}`);
      return;
    }
  
    spotifyApi
      .authorizationCodeGrant(code)
      .then(data => {
        const access_token = data.body['access_token'];
        const refresh_token = data.body['refresh_token'];
        const expires_in = data.body['expires_in'];
  
        spotifyApi.setAccessToken(access_token);
        spotifyApi.setRefreshToken(refresh_token);
  
        console.log('access_token:', access_token);
        console.log('refresh_token:', refresh_token);
        
        const fs = require('fs')
        fs.writeFile('token.txt', access_token, err => {
          if (err) {
            console.error(err)
            return
          }
        })
  
        console.log(
          `Sucessfully retreived access token. Expires in ${expires_in} s.`
        );
        res.send('Success! You can now close the window.');
  
        setInterval(async () => {
          const data = await spotifyApi.refreshAccessToken();
          const access_token = data.body['access_token'];
          
  
          console.log('The access token has been refreshed!');
          console.log('access_token:', access_token);
          spotifyApi.setAccessToken(access_token);
          fs.writeFile('token.txt', access_token, err => {
            if (err) {
              console.error(err)
              return
            }
          })
        }, expires_in / 2 * 1000);
      })
      .catch(error => {
        console.error('Error getting Tokens:', error);
        res.send(`Error getting Tokens: ${error}`);
        });
  });
  
  app.listen(8090, () =>
    console.log(
      'HTTP Server up. Now go to http://localhost:8090/login in your browser.'
    )
  );