Is this possible with and without knowing the private key of the wallet.


You may try this...

function getBalanceOf(tokenAddress, walletAddress) {

// The minimum ABI to get ERC20 Token balance
let minABI = [
  // balanceOf
  // decimals

if (typeof web3 !== 'undefined') {
        web3 = new Web3(web3.currentProvider);
    } else {
        // set the provider you want from Web3.providers
        web3 = new Web3(new Web3.providers.HttpProvider("https://ropsten.infura.io/v3/placeyourAPIkeyhere"));

// Get ERC20 Token contract instance
let contract = new web3.eth.Contract(minABI, tokenAddress);

// Call balanceOf function
contract.methods.balanceOf(walletAddress).call().then(function (result) {

//Do something that you want here when you get a result/balance




Sure, this is possible. Something like this:

var tokenContract = new web3.eth.Contract([
    "constant": true,
    "inputs": [
        "name": "_owner",
        "type": "address"
    "name": "balanceOf",
    "outputs": [
        "name": "balance",
        "type": "uint256"
    "payable": false,
    "stateMutability": "view",
    "type": "function"
  }], '0x<address of token contract>');
var balance = tokenContract.methods.balanceOf.call ('0x<address of token holder>');

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