SearXNG + OpenAI SEO Blog Draft Workflow in n8n (Webhook)

Turn research into SEO blog drafts—automatically

This n8n workflow generates SEO-focused blog article drafts by researching your topic with SearXNG, drafting and scoring the post with an OpenAI-compatible LLM, and then saving the result to Payload CMS—either on-demand via webhook or automatically on an hourly schedule.

What this workflow does

• Triggers: Runs when you POST to the blog-article webhook endpoint, or every hour to auto-propose a new topic using an OpenAI-compatible LLM.
• Context setup: Normalizes the incoming subject and word budget into a run context.
• Topic research: Asks the LLM to produce six web search queries, then searches them in SearXNG, aggregating and cleaning/deduplicating SERP evidence used for SEO grounding.
• Keyword research: Generates primary/secondary keywords, relevant questions, and content gaps—grounded in the collected SERP data.
• Draft generation: Writes a structured blog draft (title, slug, SEO fields, and content blocks) using the keyword research and SERP evidence.
• Quality critique + optional revision: Runs an LLM critique scoring quality/SEO/editorial criteria; if it fails the threshold, performs one full revision pass.
• Publish to CMS: Validates the final content against an allowed block list and POSTs the draft to Payload CMS. The webhook caller receives a JSON response; scheduled runs log outcomes.

Use cases

• SaaS operators needing consistent SEO content pipelines without manual research and outlining.
• Automation engineers building “research → draft → score → publish” flows for a marketing team.
• Teams that want hourly topic ideation and quick blog drafts ready for review in Payload CMS.

Technical details

• Triggers: Webhook trigger (blog-article) and Schedule Trigger (hourly).
• Core logic nodes: if, code, http request, sticky note.
• LLM access: Uses an OpenAI-compatible API credential with LangChain Chat model nodes across all LLM steps (topic discovery, query seeding, keyword research, drafting, critique, and revision).
• Search: SearXNG for SERP retrieval and evidence grounding.
• CMS output: Saves validated draft data to Payload CMS.