AI Agent: Dynamic HTML Generator with OpenAI & Tailwind CSS

Unlock Rapid UI Prototyping with this AI Agent

This n8n workflow acts as an AI Agent with a core ability: dynamic HTML page generation. It takes a simple text prompt describing a desired webpage or UI element (e.g., "a login form with a remember me checkbox") and leverages OpenAI's advanced capabilities (GPT-4o with structured JSON output and an LLM for JSON-to-HTML conversion) to design and generate the corresponding HTML.

While experimental, this agent is a powerful demonstration of how AI can be used for rapid UI prototyping. It's particularly useful for founders, CTOs, and developers looking to quickly visualize ideas, create mockups, or even generate simple web pages on the fly by simply describing them.

This agent showcases the power of OpenAI's structured output feature, ensuring the initial UI design is returned in a predictable JSON format based on a detailed schema. This JSON is then intelligently converted into an HTML snippet and styled with Tailwind CSS, all served up via a simple webhook.

Key Features & Benefits

• AI-Powered HTML Generation: Describe what you want (e.g., 'a signup form', 'a hero section for a SaaS product') and let the AI build the initial HTML structure.
• Leverages OpenAI GPT-4o: Utilizes advanced LLMs for both understanding the user request to generate a UI structure and for converting that structure to HTML.
• Guaranteed JSON Structure: Employs OpenAI's structured output (via response_format: { type: "json_schema" }) for reliable UI component definition, a key technique for building robust AI applications.
• Tailwind CSS Integration: Generated HTML is automatically styled with Tailwind CSS via a CDN link, providing a modern, clean aesthetic out-of-the-box.
• Webhook Triggered: Call the agent via its webhook URL using a 'query' parameter (e.g., YOUR_N8N_URL/webhook/YOUR_PATH?query=your idea) to get instant HTML.
• Two-Step AI Process:
  1. An initial AI call to GPT-4o designs the UI based on your prompt and a predefined, detailed JSON schema, outputting structured UI data.
  2. A subsequent AI call (using GPT-4o-mini by default) transforms this structured JSON into a browser-renderable HTML snippet and page title.
• Rapid Prototyping: Go from a textual idea to a visual HTML mockup in seconds, significantly accelerating design and development iterations.
• Customizable AI Prompts: The system prompts for both AI steps can be adjusted within the workflow to refine the design style, copywriting tone, or HTML conversion logic.

• An n8n instance (Cloud or self-hosted).
• OpenAI API Key with access to suitable models (e.g., gpt-4o or gpt-4o-2024-08-06 for the first step, and gpt-4o-mini for the second step is recommended).
• Your n8n instance's webhook URL must be publicly accessible if you intend to call it from external services or browsers directly.

1. Download the n8n workflow JSON file.
2. Import the workflow into your n8n instance.
3. Configure the 'Open AI - Using Structured Output' node (which is an HTTP Request node):
   • Go to 'Authentication' and select 'Predefined Credential Type'.
   • Choose 'OpenAI API' for 'Credential Type'.
   • Select or create your OpenAI API credentials.
4. Configure the 'OpenAI - JSON to HTML' node:
   • Select your OpenAI API credentials in the 'Credential for OpenAI API' field.
   • You can adjust the 'Model ID' if needed (default is gpt-4o-mini).
5. Review the system prompts in both OpenAI interaction nodes ('Open AI - Using Structured Output' and 'OpenAI - JSON to HTML') and customize if necessary.
6. Ensure the OpenAI models specified (e.g., gpt-4o-2024-08-06 in the HTTP Request node, gpt-4o-mini in the OpenAI node) are available to your API key.
7. Activate the workflow.
8. To use, access the production URL of the 'Webhook' node. You can find this URL in the Webhook node's settings. Append ?query= followed by your URL-encoded text request (e.g., https://<YOUR_N8N_INSTANCE_URL>/webhook/d962c916-6369-431a-9d80-af6e6a50fdf5?query=a%20pricing%20table%20with%20three%20tiers).