Overview
Full-featured NFT marketplace built to understand Web3 from first principles. Not just another tutorial project - comprehensive testing, real-time features, and production-ready architecture.
Key Features
Smart Contract (ERC-721)
- Batch minting: Mint up to 20 NFTs in a single transaction
- Royalty management: Creator royalties built into the contract
- Gas optimization: Efficient loops and storage patterns
- OpenZeppelin base: Following security best practices
Marketplace Features
- Real-time trading feed: WebSocket updates for all marketplace activity
- Analytics dashboard: Trading volume, popular collections, price trends (Recharts)
- IPFS metadata: Decentralized storage for NFT data via Pinata
- Event indexing: Blockchain events → PostgreSQL for fast queries
Trading Lifecycle
- Mint NFTs with metadata and images
- List for sale with custom pricing
- Browse marketplace with filters
- Purchase with wallet connection
- Transfer ownership on-chain
- View trading history and analytics
Technical Achievements
Comprehensive Testing
- 52 smart contract tests covering all functions and edge cases
- 50+ integration tests validating complete user flows
- Gas usage optimization verified through test metrics
- Security testing for reentrancy, overflow, access control
Event Indexing
- Real-time blockchain event listener
- Batch processing for historical events
- PostgreSQL storage for fast queries
- WebSocket updates to connected clients
Architecture
- Smart contracts: Hardhat development environment
- Blockchain interaction: ethers.js with provider failover
- Backend: Node.js Express API for indexed data
- Frontend: React with wallet integration (MetaMask)
- Storage: IPFS for metadata, PostgreSQL for indexed events
What I Learned
Writing 52 comprehensive tests taught me more about Solidity than any tutorial. Edge cases, gas optimization, and security patterns only become clear when you're trying to break your own code.
Also learned that blockchain development is 30% writing contracts and 70% building infrastructure around them - indexing, caching, and serving data efficiently.
Tech Stack
Smart Contracts: Solidity 0.8.x, OpenZeppelin, Hardhat Blockchain: ethers.js, MetaMask integration Backend: Node.js, Express, PostgreSQL Frontend: React, TypeScript, Web3 UI components Storage: IPFS (Pinata), PostgreSQL Testing: Hardhat tests, Mocha/Chai Deployment: Docker, local Hardhat network