RSSible (html | json)

Paste a URL and CSS selectors; get an RSS feed; free and opensource.

Runs entirely on the free tier of Cloudflare workers. Click on the demo links ⤸ to see it in action.

Product Hunt: the front page
Anthropic news (special @ for link means the item selector itself)
HN Algolia: HN posts filtered to Github links only; ≥100 points (JSON page)
Github /stars: (any) user stars (JSON page)
Reddit r/science: top 10 over 7-days window; filtered to Neuroscience & Psychology
IMDb Sci-Fi Series: latest; ≥10k votes

Important: don't repeat the item selector in title/link/desc/date selectors. Think of the item as the div container for, say, article, and item details as child/nested elements inside each article.

JSON pages: internally converted to HTML (nested div elements), where class names match the JSON keys, e.g.,title becomes class="title". This means you can use the same CSS selectors as HTML pages. Root object has special _root class; array items _item class. Use ?mirror=1 param to see the converted HTML version of a JSON page (example; json link).

Pro tip: filters are inclusive - they include items that match the pattern. To exclude, use a negative lookahead, e.g. /^(?!.*(perl)).*$/ matches everything except strings containing "perl".

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