Fix Hardhat Contract Deployment Errors

You will learn how to deploy contracts with Hardhat using scripts and Ignition.

The Problem

The hardhat deploy contract pattern is frequently misapplied in smart contract and dapp development, leading to vulnerabilities, gas inefficiencies, or logic errors. This guide shows the correct implementation and common pitfalls to avoid.

Quick Fix

Wrong

const wallet = new ethers.Wallet("0xabc...", provider);

Private key hardcoded in source. If committed to git, funds are compromised immediately.

Right

// hardhat.config.js: accounts: [process.env.PRIVATE_KEY]. Run: npx hardhat run scripts/deploy.js --network sepolia

Private key loaded from environment variable. Not hardcoded. Safe for version control.

Prevention

• Never hardcode private keys in source files
• Use environment variables or encrypted keystores
• Use Hardhat Ignition for declarative deployments
• Verify deployments with DodaTech's deploy checker
• Test deployments on local fork first

DodaTech Tools

Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro. Doda Browser's developer tools include a Solidity debugger and transaction inspector. DodaZIP archives secure contract templates for team collaboration. Durga Antivirus Pro scans deployed contracts for known vulnerability signatures.

FAQ