How to get spotify access token -Spotify Web API Node : I reffered the link https://www.npmjs.com/package/spotify-web-api-node

**code sample**

    var SpotifyWebApi = require('spotify-web-api-node');
 
    // credentials are optional
     var spotifyApi = new SpotifyWebApi({
     clientId: 'fcecfc72172e4cd267473117a17cbd4d',
     clientSecret: 'a6338157c9bb5ac9c71924cb2940e1a7',
     redirectUri: 'http://www.example.com/callback'
    });

In this how can i get the access token..?

Please help me