Open source quran api, not only quran text, this api is also equipped with audio recitation and you can change the audio according to the recitation of the Imam that you like
REST API Al-Quran Indonesia dengan terjemahan, tafsir (Kemenag, Quraish Shihab, Al-Jalalain), audio murottal (per surah dan ayat dari 6 qori), random ayat.