Returns RSS feed in JSON format using feed URL.
RSS feed to JSON 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.

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Yes. The RSS feed to JSON 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 RSS feed to JSON API requires no authentication, so you can start making requests without signing up.
Yes. The RSS feed to JSON API supports CORS, so front-end JavaScript can call it directly.
Yes. The RSS feed to JSON API is served over HTTPS, so it's safe to use in production.