🔐 Quote App - OAuth + Redis Rate Limiting

A full-stack application that demonstrates Google OAuth 2.0 authentication, Redis-based rate limiting, and PostgreSQL persistence using modern backend and frontend tools.

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🚀 Features

• Google OAuth 2.0 authentication using Passport.js
• Session-based login/logout
• Random motivational quote generator
• Redis (Upstash) powered per-user rate limiting
• PostgreSQL + Prisma for user storage
• Protected API routes
• React frontend with rate limit indicators

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🧱 Tech Stack

Backend

• Node.js + Express
• Passport.js (Google OAuth 2.0)
• PostgreSQL
• Prisma ORM
• Redis (Upstash)
• express-session

Frontend

• React (Vite)
• Fetch API
• Simple inline styling

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🔑 Authentication Flow (Google OAuth)

1. User clicks Login with Google
2. Redirected to Google OAuth consent screen
3. Google sends user data to /auth/google/callback
4. User is created/fetched from PostgreSQL
5. Session is stored using cookies
6. Authenticated user can access protected routes

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⚡ Rate Limiting with Redis

• Each logged-in user can fetch 5 quotes per minute
• Redis stores counters with TTL
• Headers returned to frontend:
  • X-RateLimit-Limit
  • X-RateLimit-Remaining
  • X-RateLimit-Reset

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Environment variables

PORT=4000 DATABASE_URL=postgresql://... GOOGLE_CLIENT_ID=your_google_client_id GOOGLE_CLIENT_SECRET=your_google_client_secret REDIS_URL=your_upstash_redis_url SESSION_SECRET=supersecret

🆓 Cost & Billing

Google OAuth 2.0 → Free Passport.js → Free Redis (Upstash free tier) → Free PostgreSQL (Neon free tier) → Free No payment method required for OAuth.