n8n Social Post Generator Workflow (Webhook + AI Copy + Images)

Generate ready-to-post social content (and matching images) with one webhook

This n8n Social Post Generator Workflow lets you send a POST request to /webhook/social-content with a topic and context—then automatically returns LinkedIn, X, Facebook, and Instagram posts (plus an optional image) as a single JSON response.

What this workflow does

Designed for fast, professional social media automation, the workflow:

• Receives a webhook payload (topic, context, provider selection, plus optional tone/audience/brand/CTA/language and image settings).
• Normalizes and validates input, including provider choice, content length limits, and image options—returning a 400 error if required fields are missing or invalid.
• Generates platform-specific copy for LinkedIn, X, Facebook, and Instagram using Anthropic Claude, Google Gemini, or OpenAI.
• Optionally generates an image when enabled:
  • OpenAI Images (gpt-image-1) or Gemini Flash Image, based on your Instagram image idea, style, and size.
• Merges results into one JSON response containing the generated text and (if requested) the image—or an image error if generation fails.
• Returns success (200) or a 500 error if text generation fails.

Use cases

• SaaS operators generating weekly updates from product release notes.
• Automation engineers producing consistent social copy for multiple platforms from a single content brief.
• Teams testing different tones/CTAs and comparing results across OpenAI, Claude, and Gemini.

Technical details

• Webhook trigger: POST endpoint at /webhook/social-content
• AI providers: Anthropic Claude, Google Gemini, OpenAI
• Image generation (optional): OpenAI Images (gpt-image-1) or Gemini Flash Image
• n8n nodes mentioned: if, set, code, switch, webhook, sticky note

Setup note: configure at least one text provider credential (Claude/Gemini/OpenAI), and add the required credentials if you enable image generation.