n8n Webhook: Turn YouTube Transcripts into Newsletters & Social Posts

Turn any YouTube transcript into a ready-to-publish newsletter—plus X and LinkedIn posts—via a single webhook

This n8n Webhook workflow takes a YouTube URL (or video ID), retrieves or accepts the transcript, and uses OpenAI to generate a structured newsletter issue and repurposed social content. Everything is returned as JSON (including a newsletter Markdown version) in the webhook response—perfect for automating your content pipeline.

What this workflow does

• Receives a POST request with a YouTube URL (e.g., { "url": "" }) and extracts/validates the video ID.
• Uses your provided transcript when included in the request body (e.g., { "transcript": "..." }), otherwise it fetches captions from youtubetranscript.com and parses them into plain text.
• Sends the transcript to OpenAI (Chat Completions API) to generate a structured output for:
  • Newsletter subject line, preview text, and sections
  • Key takeaways
  • X thread content
  • LinkedIn post content
  • A call to action
• Normalizes the OpenAI response into consistent fields and generates a newsletter Markdown version.
• Returns the full result as JSON in the webhook response for easy downstream automation.

Use cases

• Publish a newsletter every time a creator uploads a YouTube video—without manual rewriting.
• Convert long-form educational videos into an X thread and LinkedIn post set for consistent social scheduling.
• Build a SaaS content engine that ingests YouTube links and returns ready-to-post drafts through an n8n webhook endpoint.

Technical details

• n8n nodes: Webhook, Code, HTTP Request, Respond to Webhook
• External services: OpenAI Chat Completions API and youtubetranscript.com (with the option to bypass via provided transcript)
• Authentication: add your OpenAI API key where the workflow uses YOUR_OPENAI_API_KEY