Get track or playlist URL from user query

Shortify.js

// Base64 encoding of your credentials
let clientID = '<your client id>'
let clientSecret = '<your client secret>'
let cred = clientID + ':' + clientSecret
let credEncoded = Data.fromString(cred).toBase64String()
let auth = 'Basic ' + credEncoded

// Get token
let tokenURL = 'https://accounts.spotify.com/api/token'
var reqToken = new Request(tokenURL)
reqToken.method = 'POST'
reqToken.body = 'grant_type=client_credentials&undefined='
reqToken.headers = {
  'Content-Type': 'application/x-www-form-urlencoded',
  'Authorization': auth
}

let res = await reqToken.loadJSON()
let token = res['access_token']
let auth2 = 'Bearer ' + token

// Params
var q = encodeURI(URLScheme.parameter('query'))
var t = URLScheme.parameter('type')

let endpoint = 'https://api.spotify.com/v1/search?q=' + q + '&type=' + t
let method = 'GET'
let headers = {
  'Accept': 'application/json',
  'Content-Type': 'application/json',
  'Authorization': auth2
}

// Make the request
let req = new Request(endpoint)
req.method = method
req.headers = headers

// Get the track URL
let json = await req.loadJSON()

var finalURL = ''
if (t == 'track') {
  finalURL = json['tracks']['items'][0]['external_urls']['spotify']
} else {
  finalURL = json['playlists']['items'][0]['external_urls']['spotify']
}

// Open the track on Spotify
Safari.open(finalURL)