RSS Post Bot

RSS Post Bot polls one RSS/Atom feed on a schedule and publishes new entries to Reddit.

It keeps a checkpoint and dedupe history so feed reorder/edits do not repost old content.

What moderators can use it for

• Auto-post your podcast/news/blog feed into a subreddit.
• Post as link posts or self posts.
• Control cadence and safety limits per installation.

Setup (moderators)

1. Install the app.
2. Open installation settings.
3. Configure:
   • feedUrl: RSS/Atom URL to poll.
   • targetSubreddit: destination subreddit (or u_<username> for profile posts).
   • pollMinutes: polling interval in minutes (60 = hourly).
   • maxPostsPerRun: max entries posted in one run (1 recommended to start).
   • maxDedupeTrack: number of recent fingerprints remembered to avoid duplicates.
   • postKind: self or link.
   • titlePrefix: text prefixed to each post title.
   • maxBodyChars: max self-post body length before clipping.
4. Save settings and wait for the first scheduled run.

Posting behavior

• First run posts only the newest entries up to maxPostsPerRun (not full backfill).
• Checkpoint state is updated after each successful post for crash safety.
• Titles are explicit and clipped to Reddit-safe limits.
• Body text is derived from feed content and converted from HTML to Reddit markdown.

Domain exceptions limitation (important)

Devvit fetch permissions are restricted to exact, pre-approved hostnames per app release. Moderators cannot override this from subreddit settings.

If your feedUrl hostname is not in the list below, polling will fail until the app is updated.

When you hit a domain exception:

1. Check the hostname in your feedUrl (example: feeds.example.com).
2. Compare it to the Fetch Domains list in this README.
3. If it is missing, contact the maintainer with:
   • the requested hostname
   • a sample feed URL
4. After the maintainer ships an update that includes that hostname, reinstall/upgrade the app and re-save settings.

Fetch Domains

This app currently fetches from:

• feeds.acast.com
• feeds.megaphone.fm
• feeds.npr.org
• feeds.simplecast.com
• rss.buzzsprout.com
• www.omnycontent.com
• thecleanpaper.com
• www.relay.fm
• www.swr.de
• www.theguardian.com

This list must stay in sync with the http.domains array in devvit.json.

Developer documentation

The previous technical/developer README has moved to DEVELOPER.md.

Support

• Repo and issues: github.com/jghaines/devvit-rss-to-post-bot