spotify-web-api-demo

https://spotify-web-api-demo.herokuapp.com/

This demo shows how to access the Spotify Web API using Kotlin and Spring Boot.

Running locally

Start the service with:

./gradlew bootRun

Ensure the required environment variables are configured before running.

Required environment variables

Set these values when deploying (e.g., to Cloud Run) so callback URLs and API credentials are available at runtime:

• BASE_URL – Public URL of the running service (used as a fallback for callbacks)
• SPOTIFY_CLIENT_ID – Spotify application client ID
• SPOTIFY_CLIENT_SECRET – Spotify application client secret
• LASTFM_API_KEY – Last.fm API key
• LASTFM_API_SECRET – Last.fm API secret
• Last.fm endpoints default to HTTPS. Override LASTFM_API_URL and LASTFM_AUTHORIZE_URL only if custom values are required.

Yearly playlists

Enter your Last.fm login on the main page and click LAST.FM to refresh yearly playlists. The refresh runs in the background and logs progress to the application console. To avoid overwhelming Last.fm, yearly charts are fetched sequentially rather than all at once.