AI Email Writer

AI-powered Chrome Extension that generates contextual email replies directly inside Gmail using a cloud-deployed Spring Boot backend integrated with Google Gemini API.

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🌐 Live Backend

🔗 https://ai-email-writer-crn8.onrender.com

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📌 Project Overview

AI Email Writer is a full-stack application that:

• Injects an "AI Reply" button inside Gmail
• Generates professional email responses using AI
• Communicates with a secure cloud-deployed Spring Boot backend
• Uses environment-based configuration for API security
• Is fully Dockerized and deployed on Render

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🏗 System Architecture

The request flow works as follows:

1. Gmail UI (Chrome Extension)
2. Content Script (DOM Injection + Fetch API)
3. Spring Boot REST API (Hosted on Render)
4. Google Gemini API
5. AI-generated email response returned to Gmail

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🛠 Tech Stack

Frontend (Chrome Extension)

• JavaScript
• Chrome Manifest V3
• DOM Manipulation
• MutationObserver
• Fetch API

Backend

• Spring Boot 3
• Maven
• REST APIs
• Google Gemini API
• CORS Configuration
• Environment Variables

Deployment

• Render (Cloud Deployment)
• GitHub

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🔐 Security Implementation

• API keys stored securely using environment variables
• No secrets committed to GitHub
• Backend-only AI API communication
• CORS configured for secure cross-origin access
• Dynamic port binding for cloud environments:i API ↓ Generated Email Response

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🧪 API Endpoints

🔹 Health Check

Response

{
  "status": "UP",
  "service": "AI Email Writer Backend"
}

POST /api/email/generate
{
  "emailContent": "Test email",
  "tone": "professional"
}
Generated AI reply text