Process Testimonials with GPT-4 & Auto-Generate Social Media Cards with Google Sheets β€” n8n Workflow

High complexityπŸ”— Webhook16 nodesπŸ‘©β€πŸ’» IT Opsby Jitesh Dugar

Overview

Automated AI-Powered Testimonial Processing & Social Media Workflow Overview: This comprehensive workflow automates the entire testimonial collection and publishing process, from submission to social media-ready content. It uses AI to enhance testimonials, generates beautiful branded cards, and implements an approval system before posting.

Key Features: βœ… Webhook-based submission - Accept testimonials via API πŸ€– AI Enhancement - GPT-4 polishes grammar while maintaining authenticity 🎨 Automated D

Nodes used

Google SheetsHTTP RequestSlackGoogle DriveCodeOpenAI

Workflow Preview

πŸš€ WORKFLOW START: TESTIMONIAL COLLECTION
Purpose: Entry point for testimonial submissions
Expected Data:
- name or Name
- designation/Designation/role
- testimonial_text/testimonial/Testi
βœ… DATA VALIDATION & CLEANING
What it does:
- Extracts data from webhook payload
- Validates required fields (name, testimonial)
- Sets default values for missing fields
- Generates fallback av
πŸ€– AI ENHANCEMENT SETUP
AI Instructions:
- Fix grammar and spelling
- Keep natural and conversational
- Maintain enthusiasm
- No fake details
🧠 OPENAI PROCESSING
Model: GPT-4 Turbo Preview
What happens:
1. Sends prompt + testimonial to OpenAI
2. AI improves grammar and readability
3. Preserves original meaning and tone
πŸ“¦ EXTRACT AI RESPONSE
What it does:
- Extracts enhanced text from OpenAI response
- Handles multiple response formats
- Merges with original data
- Tracks enhancement metadata
🎨 HTML TEMPLATE GENERATION
What it does:
- Creates beautiful testimonial card
- Responsive design with gradient background
- Professional styling with Inter font
- 5-star rating display
πŸ“Έ HTML TO IMAGE CONVERSION
Service:(https://htmlcsstoimg.com)
What it does:
- Converts HTML template to PNG image
- Renders at 800x600px
- Returns image URL
⬇️ DOWNLOAD IMAGE
What it does:
- Fetches PNG from URL
- Downloads as binary file
- Prepares for Google Drive upload
HTTP Request Settings:
☁️ GOOGLE DRIVE UPLOAD
What it does:
- Uploads PNG to Google Drive
- Saves to "testimonial data" folder
- Uses dynamic filename from HTML node
- Returns shareable link and Drive ID
πŸ“’ SLACK NOTIFICATION
Notification Includes:
βœ“ Customer name, role, email
βœ“ Enhanced testimonial
βœ“ Original testimonial (comparison)
βœ“ Image preview link
⏰ SCHEDULE TRIGGER - APPROVAL CHECKER
Purpose: Automated approval monitoring
Trigger: Every 5 minutes
What it does:
- Checks Google Sheet for approved testimonials
- Identifies testi
πŸ“– READ DATABASE
Data Retrieved:
- All testimonial records
- Status column (Approved/Pending/Rejected)
- Posted to Social column
- Drive ID for matching
βœ”οΈ CONDITIONAL FILTER
What it does:
- Filters testimonials based on conditions
- Only passes approved testimonials
- Excludes already posted ones
Logic:
πŸ“± SOCIAL MEDIA READY NOTIFICATION
Notification Contains:
βœ“ Customer details
βœ“ Enhanced testimonial
βœ“ Original testimonial
βœ“ Image preview link
πŸ”„ MARK AS PROCESSED
What it does:
- Updates Google Sheet record
- Marks testimonial as processed
- Adds timestamp
πŸ“Š DATABASE UPDATE
Data Saved:
βœ“ Timestamp, Name, Designation, Email
βœ“ Original + Enhanced testimonial
βœ“ Image link (shareable)
βœ“ Status: "Pending Approval"
πŸ“‹ SETUP CREDENTIALS FIRST
Required API Credentials:
1. OpenAI API πŸ€–
- Sign up at: https://platform.openai.com
- Get API key from dashboard
2. HTML/CSS to Image API
πŸ§ͺ TEST WORKFLOW
Set Headers:
- `Content-Type`: `application/json`
Paste this in Body (raw JSON):
```json
{
⚑
W
Webhook Trigger
Data Validation
S
Set AI Prompt
OpenAI Enhancement
Extract AI Response
Generate HTML Template
H
HTML/CSS to Image
Download Image
Upload to Google Drive
Update Google Sheet
Send Slack Notification
⚑
E
Every 5 Minutes
Read Google Sheet
I
IF Approved & Not Posted
Notify Ready to Post
Mark as Posted
16 nodes14 edges

How it Works

  1. 1

    Trigger

    The workflow starts with a webhook trigger.

  2. 2

    Process

    Data flows through 16 nodes, connecting code, googledrive, googlesheets.

  3. 3

    Output

    The workflow completes its automation and delivers the result to the configured destination.

Node Details (16)

GO

Google Sheets

googleSheets

#1
HT

HTTP Request

httpRequest

#2
SL

Slack

slack

#3
GO

Google Drive

googleDrive

#4
CO

Code

code

#5
OP

OpenAI

n8n-nodes-langchain.openAi

#6

How to Import This Workflow

  1. 1Click Download JSON button on the right to save the workflow file.
  2. 2Open your n8n instance. Go to Workflows β†’ New β†’ Import from file.
  3. 3Select the downloaded process-testimonials-with-gpt-4-auto-generate-social-media-cards-with-google-sheets file and click Import.
  4. 4Set up credentials for each service node (API keys, OAuth, etc.).
  5. 5Click Test Workflow to verify everything works, then activate it.

Or paste directly in n8n β†’ Import from JSON:

{ "name": "Process Testimonials with GPT-4 & Auto-Generate Social Media Cards with Google Sheets", "nodes": [...], ...}

Integrations

codegoogledrivegooglesheetshttprequestifn8n-nodes-htmlcsstoimage.htmlcsstoimageopenaischeduletriggersetslackwebhook

Get This Workflow

Download and import in one click

Download JSONView on n8n.io
Nodes16
Complexityhigh
Triggerwebhook
CategoryIT Ops

Created by

Jitesh Dugar

Jitesh Dugar

@jiteshdugar

Tags

codegoogledrivegooglesheetshttprequestifn8n-nodes-htmlcsstoimage.htmlcsstoimageopenaischeduletriggersetslack
⚑

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