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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.

🌐 Live Backend

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

📌 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

🏗 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

🛠 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

🔐 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

🧪 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