🧠 Ethers.js in Hardhat – Full Guide with Code, Terms & When to Use

Ethers.js is the backbone of interacting with smart contracts in JavaScript.

In Hardhat, it comes pre-integrated so you can test, deploy, and simulate interactions with ease.

Below is a breakdown of every essential concept from your cheat sheet — explained in detail:

✅ 1. getSigners() — Get Default Accounts

const [owner, addr1, addr2] = await ethers.getSigners();

🔍 What it means:

• This gives you the list of accounts provided by the Hardhat local network (fake accounts with fake ETH).
• Each is a Signer, meaning it can send transactions and sign messages.

📘 When to use:

• In tests or scripts, when you want to simulate multiple users.
• owner is usually the contract deployer.
• addr1, addr2 are test users.

✅ 2. getContractFactory() — Load a Contract

const MyContract = await ethers.getContractFactory("MyContract");

🔍 What it means:

• Think of this like loading the blueprint (ABI + bytecode) of the contract so that you can deploy or interact with it.