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Manga database: series, releases, groups and reading lists
Anime and Manga Database and Community.
MyAnimeList API is a free Anime API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Details from myanimelist.net.

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Manga database: series, releases, groups and reading lists
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The MyAnimeList API is provided by MyAnimeList.net (myanimelist.net).
Yes. The MyAnimeList 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.
Yes. The MyAnimeList API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the MyAnimeList API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The MyAnimeList API is served over HTTPS, so it's safe to use in production.