How to get the ERC-20 token balance of an account using etherjs?

Question

I want to get the ERC-20 token balance of an account using ethers.js. Could you help me?

Answer 1

You could do the following:

const ethers = require('ethers');
const genericErc20Abi = require(..../.../Erc20.json);
const tokenContractAddress = '0x...';
const provider = ...; (use ethers.providers.InfuraProvider for a Node app or ethers.providers.Web3Provider(window.ethereum/window.web3) for a React app)
const contract = new ethers.Contract(tokenContractAddress, genericErc20Abi, provider);
const balance = (await contract.balanceOf((await provider.getSigners())[0].address)).toString();

This will return the result in wei. If you want to know the exact amount of token with its token name then you need to divide it with its decimal. For example if you want to get USDC amount you need to divide the result by 10^6.

const balance = ((await contract.balanceOf((await provider.getSigners())[0].address))/10**6).toString();

The final output will be "TokenAmount USDC" (example 10 USDC).