Get Spotify API Token with Javascript

get-spotify-token.js

import axios from 'axios';
import qs from 'qs';

// your application requests authorization
var CLIENT_ID = 'your-app-id';
var CLIENT_SECRET = 'your-app-secret';
var accessToken = '';

axios({
  method: 'post',
  baseURL: 'https://accounts.spotify.com/api/token',
  data: qs.stringify({ grant_type: 'client_credentials' }),
  headers: {
    'Content-Type': 'application/x-www-form-urlencoded',
    Authorization: `Basic ${new Buffer(
      CLIENT_ID + ':' + CLIENT_SECRET
    ).toString('base64')}`
  }
})
  .then(function(response) {
    console.log(response);
    // save the token
    accessToken = response.data.access_token;
  })
  .catch(function(error) {
    console.log(error);
  });