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Streamline Content Creation with GPT-4o and One-Click Human Review Approvals

Cheng Siong ChinCheng Siong Chin
86 views
2/3/2026
Data ForwardingData FetchingWebhookHTTP RequestAPI
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Overview

Automate AI content creation from request to approval. While AI writes quickly, human review often delays delivery—and multiple tools create workflow gaps and version confusion. This unified solution streamlines the entire process, enabling teams to produce quality content at scale with transparent tracking.

How it works

Submit a form with your topic, tone, and keywords. GPT-4o generates the content and assigns a quality score (0–100). The reviewer receives an email to approve, edit, or reject the draft—all actions are automatically logged in Google Sheets for tracking and audit purposes.

Setup steps

  1. Import the workflow JSON file into n8n
  2. Connect your OpenAI and Google account credentials
  3. Update three variables in the workflow: SHEET_ID (your Google Sheets document ID), REVIEWER_EMAIL (recipient for review notifications), and WEBHOOK_URL (for form submissions)
  4. Test the workflow with a sample submission

Workflow Stages

  1. Submit a form with topic, tone, and keywords.
  2. GPT-4o generates content and assigns a quality score (0–100).
  3. Reviewer receives an email to approve, edit, or reject the draft.
  4. All review actions are automatically logged in Google Sheets with timestamps and approval status.

Requirements

n8n v1.0+ instance, OpenAI API key with GPT-4o access, and Google Workspace with OAuth2 credentials.

Custom options

Choose model: gpt-4o, 4o-mini, or 3.5-turbo. Adjust score weights: Readability 40%, Keywords 30%, Length 30%.

Key benefits

Generate drafts 99% faster and approve content 95% quicker. Centralized tracking ensures clarity and accountability.

Streamline Content Creation with GPT-4o and One-Click Human Review Approvals

This n8n workflow automates the process of generating content using GPT-4o, sending it for human review via email, and then updating a Google Sheet based on the approval or rejection. It provides a complete "human-in-the-loop" solution for content creation, ensuring quality control before final publication or use.

What it does

This workflow simplifies content creation and approval by:

  1. Triggering on Form Submission: Initiates the workflow when a new request is submitted through an n8n form.
  2. Generating Content with AI: Uses the input from the form to prompt an OpenAI Chat Model (GPT-4o) to generate content.
  3. Preparing for Review: Formats the generated content and creates dynamic approval/rejection links.
  4. Sending for Human Review: Sends an email with the generated content and the approval/rejection links to a designated reviewer.
  5. Waiting for Approval/Rejection: Pauses the workflow until the reviewer clicks either the approval or rejection link in the email.
  6. Conditional Processing: Routes the workflow based on the reviewer's decision.
  7. Updating Google Sheet (Approved): If approved, updates a specified Google Sheet with the generated content, marking it as "Approved".
  8. Updating Google Sheet (Rejected): If rejected, updates the same Google Sheet, marking it as "Rejected" and including any feedback provided.
  9. Responding to Webhook: Confirms the action (approval or rejection) back to the original form submission or source.

Prerequisites/Requirements

  • n8n Instance: A running n8n instance.
  • OpenAI API Key: An API key for OpenAI (GPT-4o model).
  • Google Sheets Account: A Google Sheets spreadsheet set up to store content requests and their approval status.
  • Gmail Account: A Gmail account configured as a credential in n8n for sending approval emails.
  • n8n Form: An n8n Form Trigger configured to capture content requests.

Setup/Usage

  1. Import the Workflow: Import the provided JSON into your n8n instance.
  2. Configure Credentials:
    • OpenAI Chat Model: Set up your OpenAI API Key credential.
    • Google Sheets: Authenticate your Google Sheets account. Select the spreadsheet and sheet where content requests and statuses will be managed. Ensure your sheet has columns for content, status, and potentially feedback.
    • Gmail: Authenticate your Gmail account for sending emails.
  3. Configure the n8n Form Trigger:
    • Set up the form fields to collect necessary information for content generation (e.g., "Topic", "Keywords", "Tone").
  4. Configure the "Basic LLM Chain" Node:
    • Adjust the prompt to guide GPT-4o based on your content requirements and the input from the n8n form.
  5. Configure the "Edit Fields" Node:
    • Ensure the fields are correctly mapped to extract the generated content and prepare the data for the approval email.
  6. Configure the "Gmail" Node:
    • Specify the recipient email address for human review.
    • Customize the email subject and body to include the generated content and the dynamic approval/rejection links. These links will point back to the "Webhook" node in the workflow.
  7. Configure the "Webhook" Node:
    • This node acts as the endpoint for the approval/rejection links. Ensure its URL is correctly embedded in the Gmail node's email body.
  8. Configure the "If" Node:
    • This node checks the status parameter from the webhook (e.g., approved or rejected) to route the workflow.
  9. Configure the Google Sheets Nodes (for Approved & Rejected):
    • Ensure these nodes are configured to write to the correct Google Sheet and update the appropriate columns (e.g., "Content", "Status", "Feedback").
  10. Activate the Workflow: Once all configurations are complete, activate the workflow.

Now, when a form is submitted, the content will be generated, sent for review, and the Google Sheet will be updated automatically based on the reviewer's decision.

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