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  "formats": "Każda podstrona ma dwie wersje z tymi samymi danymi: JSON (adres strony + .json) i markdown (adres strony + .md). Do każdego `url` w tym dokumencie można dopisać .json albo .md.",
  "title": "Effective Kotlin: Best Practices",
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  "description": "Kotlin is a powerful and pragmatic language, but it's not enough to know about its features. We also need to know when they should be used and in what way. This book is a guide for Kotlin developers on how to become excellent Kotlin developers. It presents and explains in-depth the best...",
  "editions": [
    {
      "title": "Effective Kotlin: Best Practices",
      "subtitle": null,
      "url": "https://www.kolczanksiazek.pl/marcin-moskala/effective-kotlin-best-practices/9788396684752",
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      "isbn": "978-83-9668-475-2",
      "pages": 430,
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