n8n Form Workflow: Generate LinkedIn Posts with GPT-4.1

Generate polished LinkedIn posts from an n8n Form—instantly

This n8n Form Workflow takes a topic you submit through an n8n Form, then uses OpenAI GPT-4.1-mini to generate a ready-to-post LinkedIn post in your chosen tone, language, and audience—returning the final cleaned text directly in the form response.

What this workflow does

• Collects inputs via n8n Form: requires a topic, with optional tone, language, and audience.
• Creates a structured briefing: builds a detailed prompt from your form inputs, applying defaults (e.g., English if language isn’t provided).
• Generates a LinkedIn draft using an AI agent: sends the briefing to an OpenAI Chat Model via a LangChain agent to write a 120–220 word LinkedIn post following strict style rules and ending with exactly one question.
• Cleans and formats the output: removes wrapping quotes or markdown code fences and calculates basic stats like word and character counts.
• Returns the post text: outputs the final post text directly as the form response so it’s copy-and-paste ready for LinkedIn.

Use cases

• Automation engineers submit a feature idea and instantly receive a LinkedIn post describing it.
• SaaS operators generate thought-leadership drafts tailored to a specific audience (e.g., founders, product teams, DevOps).
• Teams standardize their posting style by using consistent tone and language options through the same n8n Form.

Technical details

• Nodes / stack: code, form, sticky note, form trigger, n8nn8n-nodes-langchainagent, n8nn8n-nodes-langchainlm chat open ai.
• AI model: OpenAI GPT-4.1-mini (or another chat model you prefer).
• Setup: add your OpenAI API credentials to the OpenAI Chat Model node, activate the workflow, then use the Form trigger’s production URL.