Auto-Generate & Post AI Images to Facebook using Gemini & Pollinations AI

This n8n workflow automates the process of generating AI images based on a prompt and then posting them to a Facebook page. It leverages Google Gemini for prompt generation and Pollinations AI for image creation.

What it does

This workflow simplifies and automates the following steps:

1. Triggers on Schedule: The workflow runs at a predefined interval (e.g., daily, hourly).
2. Generates an Image Prompt: It uses the Google Gemini Chat Model via a Basic LLM Chain to generate a creative image prompt.
3. Generates an AI Image: It sends the generated prompt to the Pollinations AI API to create an image.
4. Posts to Facebook: It then takes the generated image and posts it to a specified Facebook page, along with a descriptive text.

Prerequisites/Requirements

To use this workflow, you will need:

• n8n Instance: A running instance of n8n.
• Google Gemini API Key: An API key for the Google Gemini Chat Model. This will need to be configured as a credential in n8n.
• Facebook Page: Access to a Facebook page where you want to post the images.
• Facebook Graph API Credential: A Facebook Graph API credential configured in n8n with the necessary permissions to post to your page.
• Pollinations AI (No API Key Required): The workflow uses the public Pollinations AI API, which typically does not require an API key for basic usage.

Setup/Usage

1. Import the Workflow:

   • Download the provided JSON file.
   • In your n8n instance, go to "Workflows" and click "New".
   • Click the three dots in the top right corner and select "Import from JSON".
   • Paste the JSON content or upload the file.

2. Configure Credentials:

   • Google Gemini Chat Model:
     • Locate the "Google Gemini Chat Model" node.
     • Click on the "Credential" field and select "Create New".
     • Choose "Google Gemini API" as the credential type.
     • Enter your Google Gemini API Key.
   • Facebook Graph API:
     • Locate the "Facebook Graph API" node.
     • Click on the "Credential" field and select "Create New".
     • Choose "Facebook Graph API" as the credential type.
     • Follow the instructions to connect your Facebook account and grant the necessary permissions for your page.

3. Customize Workflow Nodes:

   • Schedule Trigger: Adjust the schedule to your desired frequency (e.g., daily, hourly) by double-clicking the "Schedule Trigger" node.
   • Basic LLM Chain (Prompt Generation): You can modify the prompt in the "Basic LLM Chain" node to guide Gemini in generating different types of image descriptions.
   • HTTP Request (Pollinations AI):
     • The URL for Pollinations AI is https://image.pollinations.ai/prompt/{{$json.text}}. The {{$json.text}} part dynamically inserts the prompt generated by the previous node.
     • Review the HTTP Request node to ensure it's configured correctly for Pollinations AI (e.g., method, response format).
   • Code (Image URL Extraction): This node likely extracts the image URL from the Pollinations AI response. Ensure the code is correct if the API response format changes.
   • Facebook Graph API:
     • Page ID: Enter the ID of your Facebook page.
     • Message: Customize the text that will accompany your AI-generated image post. You can use expressions to include the generated prompt or other dynamic data.
     • Photo URL: Ensure this is correctly set to retrieve the image URL from the previous "Code" node's output.

4. Activate the Workflow:

   • Once all configurations are complete, click the "Activate" toggle in the top right corner of the n8n editor to start the workflow.

The workflow will now automatically generate AI images and post them to your Facebook page according to your set schedule.