Programming, Miscellaneous and Dark Jokes.
JokeAPI is a free Games & Comics API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
JokeAPI is a RESTful API that serves jokes from many categories while also offering a lot of filtering methods
Details from sv443.net.

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Yes. The JokeAPI is listed in the Games & Comics 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 JokeAPI requires no authentication, so you can start making requests without signing up.
Yes. The JokeAPI supports CORS, so front-end JavaScript can call it directly.
Yes. The JokeAPI is served over HTTPS, so it's safe to use in production.