What You'll Learn
This tutorial will guide you through the core concepts of Web3 development including blockchain integration, smart contract deployment, and decentralized application (DApp) development. Suitable for developers with JavaScript/TypeScript background.
Prerequisites
-
JavaScript/TypeScript Fundamentals -
Node.js Project Setup -
Basic Blockchain Concepts
Tools Required
-
Truffle or Hardhat
-
1TestRPC / Ganache
-
Metamask
Getting Started
1. Setup Project
npm init -y npm install --save-dev hardhat npx hardhat
2. Write Contract
pragma solidity ^0.8.0;
contract SimpleStorage {
uint storedData;
function set(uint x) public {
storedData = x;
}
function get() public view returns (uint) {
return storedData;
}
}
Smart Contract Coding Samples
Secure Wallet Manager
pragma solidity ^0.8.0;
contract SecureMultiSig {
address[] private signers;
// Implementation of secure multi-signature wallet
}
Requires multiple approvals for withdrawals
Token Standard
// ERC-20 Implementation
contract MyToken is Context, IERC20 {
uint256 private _totalSupply = 1000000;
Full token implementation with minting and transfer controls
Deployment
1
Compile Contracts
npx hardhat compile
2
Deploy
npx hardhat run scripts/deploy.js --network localhost
3
Test
npx hardhat test
🔒 Security & Verification
Common Vulnerabilities
- Reentrancy exploits
- Ambiguous overflow
- Possible delegate calls
Security Auditing Tips
- Use Slither for static analysis
- Run Mythril analysis
- Code testing on multiple chains
Always verify contracts on the intended network before deployment.
Ready to Build?
Start developing secure, decentralized apps using these patterns and tools. Need expert guidance?