Create curated newsletters from Reddit discussions with GPT-4o Mini and Gmail

📰 Reddit to Newsletter (Automated Curation with Open AI 4o Mini )

Turn the best posts from a subreddit into a ready-to-send HTML newsletter — no copy-pasting, no wasted time. This workflow fetches new posts, filters by topic of interest, analyzes comments, summarizes insights, and composes a clean HTML email delivered straight to your inbox with Gmail.

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💡 What this workflow does - ✅ Fetches posts from your chosen subreddit (default: r/microsaas, sorted by “new”) - 🏆 Selects the Top 10 by upvotes, comments, and recency - 🧭 Defines a topic of interest and runs a lightweight AI filter (true/false) without altering the original JSON - 💬 Pulls and flattens comments into a clean, structured list - 🧠 Summarizes each post + comments into mainpostsummary, commentinsights, and keylearnings - ✍️ Generates a newsletter in HTML (not Markdown) with headline, outline, sections per post, quotes, and “by the numbers” - 📤 Sends the HTML email via Gmail with subject “Reddit Digest” (editable)

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🛠 What you’ll need - 🔑 Reddit OAuth2 connected in n8n - 🔑 OpenAI API key (e.g., gpt-4o-mini) for filtering and summarization - 🔑 Gmail OAuth2 to deliver the newsletter - 🧵 A target subreddit and a clearly defined topic of interest

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🧩 How it works (high-level) 1. Manual Trigger → Get many posts (from subreddit) 2. Select Top 10 (Code node, ranking by ups + comments + date) 3. Set topic of interest → AI filter → String to JSON → If topic of interest 4. Loop Over Items for each valid post 5. Fetch post comments → Clean comments (Code) → Merge comments → Merge with post 6. Summarize post + comments (AI) → Merge summaries → Create newsletter HTML 7. Send Gmail message with the generated HTML