Example of API calls orchestration

examples/given-an-artist-agregate-its-tracks.js

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+const SpotifyWebApi = require('../');
+
+/**
+ * This example retrieves the aggregated tracks for an artist by orchestrating calls to several API endpoints
+ * https://developer.spotify.com/documentation/web-api/reference/#/
+ */
+
+/**
+ * Since it's not necessary to get an access token connected to a specific user, this example
+ * uses the Client Credentials flow. This flow uses only the client ID and the client secret.
+ * https://developer.spotify.com/documentation/general/guides/authorization-guide/#client-credentials-flow
+ */
+
+var clientId = 'your-client-id',
+  clientSecret = 'your-client-secret';
+
+// Create the api object with the credentials
+var spotifyApi = new SpotifyWebApi({
+  clientId: clientId,
+  clientSecret: clientSecret
+});
+
+// Retrieve an access token.
+spotifyApi.clientCredentialsGrant().then(
+  function (data) {
+    console.log('The access token expires in ' + data.body['expires_in']);
+    console.log('The access token is ' + data.body['access_token']);
+
+    // Save the access token so that it's used in future calls
+    spotifyApi.setAccessToken(data.body['access_token']);
+  }
+).catch(err => console.log('Something went wrong when retrieving an access token', err))
+
+function getArtistId(artistName){
+  return spotifyApi.searchArtists(artistName)
+  .then(resp => resp.body.artists.items[0].id)
+  .catch(err => console.log(err))
+}
+
+function getAlbumIds(artistId) {
+  return spotifyApi.getArtistAlbums(artistId, { limit: 2, offset: 0 })
+    .then(data => data.body)
+    .then(body => body.items)
+    .then(items => items.map(element => element.id))
+    .catch(err => console.log(err))
+}
+
+function getTracksFromAlbum(albumId) {
+  return spotifyApi.getAlbumTracks(albumId)
+};
+
+async function getTracksFromArtist(artistName) {
+  let artistId = await getArtistId(artistName)
+  let albumIds = await getAlbumIds(artistId)
+  // we wrap album ids into promises to fetch associated tracks from the API
+  let trackPromises = albumIds.map(id => getTracksFromAlbum(id))
+  // We resolve the promises with a fork...join approach
+  return Promise.all(trackPromises)
+}
+
+const artistOfInterest = "Elvis"
+
+// main
+getTracksFromArtist(artistOfInterest)
+  .then(resp => resp
+    .map(e => e.body)
+    .reduce((acc, x) => acc.concat(x.items), []) //Should work with a flatMap starting node11
+    .map(e => e.name))
+  .then(tracks => console.log(tracks))
+  .catch(err => console.log(err))