* This Express service tightly couples critical Spotify OAuth authorization logic directly inside the main `app.js` file. * The codebase relies on the deprecated `request` library; migrate immediately to modern `axios` or native `fetch` for robust API communication. * Utilize `const` and `let` instead of the legacy `var` keyword to enforce better scoping discipline across the application. * Decouple authentication business logic and configuration parameters from the server initialization file for maintainable architecture. * The use of raw `new Buffer.from` for Basic Auth headers should be standardized using contemporary Node.js practices.
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