Host an AI Gmail reply approval inbox with OpenAI and CustomJS
UnknownUnknown. This template uses community nodes we can't verify statically. Uses community nodes that can't be verified statically (unverified community packages are off by default in 3.0). Static check, last run 2026-10-19.
Community nodes
These come from third-party npm packages. In n8n 3.0 unverified community packages are off by default (N8N_UNVERIFIED_PACKAGES_ENABLED=false).
@custom-js/n8n-nodes-pdf-toolkit-v2(Upsert Approval Page)
Nodes used (6)
- Manual Trigger
n8n-nodes-base.manualTrigger - Pdf Toolkit
@custom-js/n8n-nodes-pdf-toolkit-v2.pdfToolkit - Gmail
n8n-nodes-base.gmail - Webhook
n8n-nodes-base.webhook - Code
n8n-nodes-base.code - OpenAI
@n8n/n8n-nodes-langchain.openAi
What it does
Quick overview Build super flexible and customizable Human-in-the-Loop (HITL) processes with n8n and CustomJS. Instead of letting AI reply autonomously, this workflow fetches data, drafts responses, and hosts interactive approval pages via CustomJS—ensuring full human quality control over your automations with optional custom domain hosting. How it works 1. Trigger: Set to run manually (or scheduled on a cron job). 2. Fetch Emails: Pulls unread messages from your Gmail inbox. 3. Filter: Discards standard no-reply and notification addresses. 4. AI Generation: OpenAI analyzes the email text and subject line to write a suggested reply. 5. Build Dashboard: A Code node merges the dataset into a premium HTML template. 6. Upsert Page: The CustomJS node hosts the generated HTML instantly. Setup 1. Configure the Base URL: Open the Build Approval Page Code node, locate the configuration section (around line 22), and replace the placeholder with your actual n8n instance URL: 2. Connect CustomJS: Add your CustomJS API token to your n8n to allow the workflow to automatically push and host the generated process pages. 3. Activate Webhook: Ensure your n8n webhook node is set to "Production" so it can reliably receive the approval and rejection signals from your hosted page. Requirements - n8n Instance: A running self-hosted or cloud instance of n8n to manage the automation logic and webhooks. - CustomJS Account: A CustomJS active account to handle the automated deployment of your frontend code. - Workflow Data Source: Connected credentials (e.g., Gmail, database, CRM) for the system you want to monitor and control. Additional info This workflow utilizes the CustomJS HTML Hosting Service to host and publish your custom human-in-the-loop process steps instantly as a clean HTML page.