Notion to LinkedIn Topic Selector via n8n Webhook Automation

Automatically pick the right LinkedIn Topic from your Notion tasks—using an n8n webhook

This Notion to LinkedIn Topic Selector workflow listens for a Notion task via webhook, finds the first available “Assunto” (topic) with a LinkedIn-ready “Anotação” that hasn’t been published yet, and then writes the selected relations back to the task and its parent tasks in Notion.

What this workflow does

• Receives a webhook POST with the Notion task page object in body.tarefa.
• Loads related Notion pages:
  • Fetches the task’s related Projetos and their Taxonomia, keeping only projects tagged “Post”.
  • For each matching Post project, loads related Conhecimentos and their Taxonomias, keeping only items tagged “Assunto”.
• Traverses the “Assunto” hierarchy:
  • Recursively loads each candidate Assunto’s Subitem structure and associated Anotações, including their Taxonomias and Resultados.
• Selects the first publishable match where an Anotação is tagged “Post” and “LinkedIn”, and has an empty “Resultados” relation (i.e., not yet published).
• Updates Notion relations:
  • Writes the chosen 📚 Conhecimentos and 📝 Anotação back to the original task.
  • Updates each related “Item pai” page with the same relations.

Use cases

• When a new content task is created in Notion, automatically assign the correct LinkedIn topic and annotation.
• Queue posts by ensuring selection only happens for Anotações whose Resultados are still empty (not published).
• Keep parent task pages consistent by updating both the task and its Item pai relations.

Technical details

• Nodes/approach: webhook, http request (Notion API with Bearer Auth), split out, if, and code, plus a sticky note for workflow notes.
• Setup requires: a Notion integration token with access to the relevant databases/pages and configuring the workflow variable Notion_Version for the Notion API request header.

Perfect for n8n automation engineers and SaaS operators building reliable Notion-driven content pipelines for LinkedIn topic selection.