Software end-of-life dates and support lifecycles.
EndOfLife.date API is a free Development API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Details from endoflife.date.

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The EndOfLife.date API is provided by endoflife.date API Documentation - (endoflife.date).
Yes. The EndOfLife.date API is listed in the Development 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 EndOfLife.date API requires no authentication, so you can start making requests without signing up.
Yes. The EndOfLife.date API supports CORS, so front-end JavaScript can call it directly.
Yes. The EndOfLife.date API is served over HTTPS, so it's safe to use in production.