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The plan for the migration, plus the reports behind it: a research pass on Vercel Web Analytics limits, the decision it forced, and five reviews of the implementation (code, tests, runtime, docs, UX). Two plan decisions were rejected during implementation and both are recorded in place rather than edited out, since the reasoning is the useful part: the next.config.mjs redirect (it forwards the source query to the destination) and the canonical-casing redirect (a cached redirect on a prerendered route corrupts the canonical URL on a case-insensitive filesystem). Also shelves the custom-events analytics plan. It cannot ship: this project is on the Vercel Hobby plan, where custom events are not included, so all twelve track() call sites would be no-ops. Its event vocabulary and privacy allowlist stay valid if the project ever moves to PostHog or upgrades.
VNGeoGuessr
A GeoGuessr clone focused on Vietnamese locations with accurate boundary detection and anti-cheat security. Play geolocation guessing games across a region tree covering the whole country using real street-level imagery.
🎮 Features
- Region Tree: Whole country, 5 provinces, 61 districts — including Da Lat (Lam Dong) and Duc Hoa (Long An)
- 360° Street View: Mapillary panoramic images with PhotoSphere viewer
- Anti-Cheat Security: Server-side session management prevents cheating
- Distance-Based Scoring: 0-5 point system based on accuracy
- Persistent Leaderboards: Redis-powered top 200 player rankings
- Accurate Boundaries: Nominatim API + Turf.js for precise city detection
📚 Documentation
For detailed information about this project, see the documentation in /docs/:
- Project Overview - Project summary and key characteristics
- Features - Complete feature list and game mechanics
- Tech Stack - Technology stack and dependencies
- Development Guidelines - Development setup and coding standards
- Game Flow - Complete gameplay flow documentation
- Project Structure - Codebase organization and architecture
🚀 Getting Started
Prerequisites
- Node.js 24+
- npm 11+
- Redis server (sessions and leaderboards)
- Postgres database (panorama index; Neon in production)
Development
# Install dependencies
npm install
# Start development server
npm run dev
# Build for production
npm run build
# Start production server
npm start
# Run linting
npm run lint
Open http://localhost:3000 to play the game.
🏗️ Built With
- Frontend: Next.js 16 + React 19 + Tailwind CSS 4
- Street View: Mapillary API + PhotoSphere Viewer
- Maps: Leaflet + OpenStreetMap
- Geographic Data: Nominatim API + Turf.js
- Storage: Neon Postgres (panorama index) + Upstash Redis (leaderboards and game sessions)
- UI Components: shadcn/ui
🎯 How to Play
- Enter your username
- Pick a region from the country/province/district tree
- View the 360° street panorama
- Place your guess on the map
- Earn points based on accuracy (closer = more points)
- Compete for the top 200 leaderboard spots!
📋 Development Notes
- JavaScript Only: No TypeScript files
- Individual Parameters: Functions use separate parameters, not object destructuring
- Server-Side Security: Game coordinates never sent to client
- Session Management: Automatic cleanup after 30 minutes
🤝 Contributing
This project follows specific development guidelines. Please read the Development Guidelines before contributing.