Content Gap Analysis using GraphRAG and PDF Files - n8n Workflow

Content Strategists: Seeking new topics based on existing research documents.
Researchers and Academics: Needing to find unexplored connections within large bodies of text.
n8n Automation Specialists: Looking for advanced examples of integrating PDF processing with external AI APIs.
Digital Marketers: Automating the ideation process by analyzing competitor reports or internal documentation.

This specialized n8n template provides a robust solution for turning static PDF research documents into dynamic content generation assets. By utilizing InfraNodus's GraphRAG technology, the n8n workflow doesn't just summarize text; it identifies 'structural gaps'—concepts within the text that are related but insufficiently connected. This process reveals novel content angles and research questions.

The core value of this n8n workflow is automation. Instead of manual text extraction and analysis, the entire process, from document upload to AI advice generation, is handled seamlessly by the sequence of n8n node operations. This sophisticated n8n template drastically reduces research time, ensuring your content strategy is constantly informed by deep, analytical insights derived directly from your source material.

This automation begins with an n8n trigger that listens for user input, processes the uploaded files, conducts the AI analysis, and finally delivers the results back to the user.

1. Form Submission Trigger: The process starts when a user uploads one or more PDF files via the hosted On form submission n8n trigger.


2. File Preparation: A custom Code n8n node processes the binary data from the upload, restructuring it to allow individual file handling in the next step.


3. Text Extraction: The Extract text from PDF files n8n node converts the PDF binaries into raw, readable plain text.


4. Data Consolidation: A subsequent Code n8n node (Prepare for InfraNodus) aggregates the extracted text from all PDFs into a single, large text string. Crucially, this node also generates a random variable (gapDepth) which controls the complexity of the gap analysis performed by InfraNodus.


5. GraphRAG Analysis: The InfraNodus GraphRAG AI Advice HTTP Request n8n node sends the consolidated text to the InfraNodus API. The n8n node is configured to request an 'idea' based on the identified structural gap.


6. Display Results: The resulting content idea or advice generated by the AI is then displayed back to the user instantly using the final Form n8n node completion step.

To deploy this powerful n8n workflow, follow these steps:

1. Import: Copy the provided JSON data and import it directly into your n8n instance using the 'New' -> 'Import from JSON' option.


2. Credentials Setup: Locate the InfraNodus GraphRAG AI Advice n8n node. This node requires an HTTP Bearer Token credential for InfraNodus. You must set up a new credential entry (e.g., 'InfraNodus DeeMeeTree API Key') and input your API key from your InfraNodus account.


3. Trigger Activation: Ensure the starting n8n trigger (On form submission) is correctly configured and activated. When active, you will receive a public URL for the form where users can upload their PDF files.


4. Testing: Execute the n8n workflow manually or submit a PDF file via the form URL to ensure the flow runs successfully and the AI advice is returned.

This n8n template utilizes several critical n8n nodes to achieve the file processing and AI integration:

On form submission (n8n trigger):
Function: Serves as the initial n8n trigger, capturing file uploads via a public-facing web form.
Key Configuration: Configured to accept .pdf file types and captures the incoming binary data.

Convert binary files to PDF (Code n8n node):
Function: Restructures the binary input from the trigger, preparing each file item for the subsequent extraction process.
Key Configuration: Custom JavaScript iterates over binary keys to create structured file objects.

Extract text from PDF files (Extract From File n8n node):
Function: Performs the critical PDF text extraction, converting complex document formats into simple, readable text that the AI can process.
Key Configuration: Operation is set to pdf, targeting the binary property derived from the previous step.

Prepare for InfraNodus (Code n8n node):
Function: Aggregates all fragmented PDF texts into a single payload and calculates a random gapDepth parameter for dynamic analysis.
Key Configuration: Concatenates item.json.text across all inputs and generates a randomNum between 0 and
2.

InfraNodus GraphRAG AI Advice (HTTP Request n8n node):
Function: Submits the massive text payload to the InfraNodus API for GraphRAG analysis and content idea generation.
Key Configuration: Uses the httpBearerAuth credential, sets requestMode: idea, and dynamically maps the consolidated text and gapDepth variable. This is the central AI component of the n8n workflow.

Display on the Form to the User (Form n8n node):
Function: Closes the transaction by displaying the generated content idea directly to the user who submitted the form.
Key Configuration: Operation set to completion, responding with the HTML-formatted text advice: {{ $json.aiAdvice[0].text }}.