Online open-access digital library for pre-modern Chinese texts.
Chinese Text Project API is a free Dictionaries API that requires no API key, is served over HTTPS and has unconfirmed CORS support.

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Indonesia dictionary many words
Word definitions, pronunciations, synonyms, antonyms and others
Yes. The Chinese Text Project API is listed in the Dictionaries 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 Chinese Text Project API requires no authentication, so you can start making requests without signing up.
CORS support for the Chinese Text Project API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The Chinese Text Project API is served over HTTPS, so it's safe to use in production.