Check user's balance (can only be 1 or 0)

index.js

// npm install web3
// get the ABI of the contract (https://mumbai.polygonscan.com/address/0xe9239a8324ee9144e6f1af0cab81a5a8d8274551#code)
// store it in ./abis/serieAToken.json
// run `node index`


const Web3 = require('web3')
const fs = require('fs');
const SerieATokenAbi = JSON.parse(fs.readFileSync('./abis/serieAToken.json'));
const web3 = new Web3('https://polygon-mumbai.infura.io/v3/8d675eea201c403e9837891cf0d36a3c');
const contractInstance = new web3.eth.Contract(SerieATokenAbi, '0xe9239a8324ee9144e6f1af0cab81a5a8d8274551');

function getBalance(userAddress) {
    contractInstance.methods.balanceOf(userAddress).call((err, result) => {
    if (err || result > 1){
        console.log(err)
    } else {
        console.log(userAddress + ' => ' + (result == 1 ? 'YES' : 'NO'));
    }
})
}

const addressesToCheck = [
    '0xd6140a3c3020454aAD17b6dB7B4f3F09952cBaa0',
    '0x50f6c98bfd04bead3c529d8fb5c81241072cc00e',
    '0x0ce538a6f7ce0473383b15d06a3f2220d51e494a',
    '0x54354b7f53ee4c8091047e87bb37da93051d672a'
]

addressesToCheck.map(getBalance)