ethers.js v6 Cheat Sheet - React Ethereum Reference

ethers.js v6 Cheat Sheet (2026)

Provider + Signer

const provider = new ethers.BrowserProvider(window.ethereum);
const signer = await provider.getSigner();
const address = await signer.getAddress();

Read Contract

const c = new ethers.Contract(addr, abi, provider);
const bal = await c.balanceOf(wallet);

Write Contract

const c = new ethers.Contract(addr, abi, signer);
const tx = await c.transfer(to, amount);
await tx.wait();

Format Helpers

ethers.parseEther("1.0")    // to BigInt
ethers.formatEther(balance)  // to string
ethers.parseUnits("100", 18)
ethers.formatUnits(amount, 6)

Events

contract.on("Transfer", (from, to, amount) => {});

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