A RESTful Quran API to retrieve an Ayah, Surah, Juz or the entire Holy Quran.
Quran Cloud API is a free Books API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Live OpenAPI reference for the Al Quran Cloud REST API — base URL https://api.alquran.cloud/v1.
Details from alquran.cloud.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Free REST API for the Runyankore-Rukiga Bible — 66 books, 31106 verses
The Quran Cloud API is provided by Al Quran Cloud (alquran.cloud). Live OpenAPI reference for the Al Quran Cloud REST API — base URL https://api.alquran.cloud/v1.
Yes. The Quran Cloud API is listed in the Books category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The Quran Cloud API requires no authentication, so you can start making requests without signing up.
Yes. The Quran Cloud API supports CORS, so front-end JavaScript can call it directly.
Yes. The Quran Cloud API is served over HTTPS, so it's safe to use in production.