Generate and publish SEO blog posts from Google Sheets to Webflow with OpenAI

Who it's for

This n8n workflow is designed for SEO managers, content creators, and blog administrators who want to automate their blog publishing pipeline. The workflow creates an end-to-end AI-powered system that can fetch content ideas from a Google Sheet, scrape existing competitor URLs, analyze SEO structure, generate high-quality articles, validate SEO scores, create thumbnail images, and automatically publish the final content to Webflow.

Features

• Automated Content Scheduling – Runs every 2 hours (or manually) to process pending blog ideas from Google Sheets.
• HTML Scraping & Cleaning – Fetches competitor URLs and removes headers, scripts, and iframes to get clean content.
• AI SEO Structure Analysis – Uses gpt-4.1-mini to extract key sections and SEO bullet points.
• AI Content Writer – Uses o4-mini to rewrite articles with proper SEO, H2/H3 tags, and keyword optimization.
• Output Parser Fixing – Ensures the AI always returns clean, structured JSON (article + summary).
• Internal Linking – Pulls existing Webflow posts and adds relevant internal links automatically.
• SEO Validation – Checks SEO scores via sub-workflow before publishing.
• AI Thumbnail Generation – Creates a 16:9 cover image based on the article topic using DALL·E.
• Auto-Publishing – Publishes content to Webflow CMS with title, image, article, summary, and read time.
• Sheet Update – Marks the processed row as “Completed” in Google Sheets.
• Error Notifications – Sends alerts via Slack, Discord, Teams, Telegram, and WhatsApp if something fails.

Requirements

• OpenAI API Credentials: For powering the content writer (o4-mini), structure analyzer (gpt-4.1-mini), prompt generator (o4-mini), and image generation (DALL-E 3).
• Google Sheets API: For reading pending blog ideas and updating their completion status.
• Webflow OAuth2 API: For fetching existing posts (for internal linking) and publishing new CMS items.
• n8n Sub-Workflow: A secondary workflow ID (7FHTcSuCIjHvvBfe) is called to evaluate the SEO score percentages of the generated content.
• Communication Platform Credentials (Optional but recommended): API tokens for Slack, Discord, Microsoft Teams, Telegram, and Rapiwa for error notifications.

Configure Credentials

• OpenAI API: Ensure your account has access to o4-mini, gpt-4.1-mini, and DALL-E 3 models.
• Google Sheets: Configure with read/write permissions for the specific spreadsheet and tab (Blogs (ideas)).
• Webflow API: Set up OAuth2 with access to the specific Site ID and Collection ID where your blog is hosted.
• Error Channels: Add your specific Channel IDs, Chat IDs, and phone numbers to the respective notification nodes.

Important Notes

• Content Looping & Error Handling: If the SEO score doesn't pass the validation check (e.g., required percentages aren't met), the workflow loops the content back to the AI writer for regeneration.
• Competitor Name Replacement: The AI prompt is strictly instructed to replace competitor names (like PixelCut, CreatorKit) with "ProductAI" to maintain brand consistency.
• CTA Linking: All Call-to-Action links within the generated articles are hard-coded in the prompt to point to create.productai.photo.
• Image Processing Delay: There is a 20-second "Wait" node implemented before publishing to Webflow to ensure the DALL-E generated image URL is active and accessible.
• Dynamic Title Extraction: The workflow uses a Regex code snippet to extract the first <h2> tag from the generated article to use as the Webflow post title (since H1 is omitted per SEO best practices).
• Data Routing: The Execute Once feature is enabled on error notification nodes to ensure you only receive one alert per failure, rather than spamming all connected channels simultaneously.

Support & Help

• WhatsApp: Chat on WhatsApp
• Discord: SpaGreen Community
• Facebook Group: SpaGreen Support
• Website: spagreen.net
• Developer Portfolio: Codecanyon SpaGreen