
Unofficial MyAnimeList API.
Jikan API is a free Anime API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Jikan is an unofficial MyAnimeList REST based API
Details from jikan.moe.

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The Jikan API is provided by Jikan - Unofficial MyAnimeList API (jikan.moe). Jikan is an unofficial MyAnimeList REST based API
Yes. The Jikan API is listed in the Anime 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 Jikan API requires no authentication, so you can start making requests without signing up.
Yes. The Jikan API supports CORS, so front-end JavaScript can call it directly.
Yes. The Jikan API is served over HTTPS, so it's safe to use in production.