How to check tron’s usdt balance?

Question

How to check my usdt balance using javascript? My account balance is 0, why is 150990000 output? What is uint256?The address is my wallet, no problem

const options = {
  method: 'POST',
  headers: {accept: 'application/json', 'content-type': 'application/json'},
  body: JSON.stringify({
    owner_address: 'TUhycsR2geBGknpwqTz3n7i63XqPUWLJjR',
    contract_address: 'TXYZopYRdj2D9XRtbG411XZZ3kM5VkAeBf',
    function_selector: 'balanceOf(address)',
    parameter: '000000000000000000000000a614f803b6fd780986a42c78ec9c7f77e6ded13c',
    visible: true
  })
};
fetch(' https://nile.trongrid.io/wallet/triggerconstantcontract', options)
  .then(response => response.json())
  .then(response => {
    async function ff(){
      console.log(response)
    let outputs = '0x'+response.constant_result[0]

    let result =  await decodeParams(['uint256'], outputs, false)

    console.log(result[0].toNumber())

    }
    ff();
    
  })
  .catch(err => console.error(err));

Answer 1

The reason you're seeing 150990000 instead of 0 could be due to the token's decimals. Many tokens use 18 decimals, so you need to divide the result by 10**18 to get the actual balance. If your token uses a different number of decimals, you'll need to adjust this accordingly.

Here's how you can do this:

console.log(result[0].dividedBy(10**18).toNumber());

This will give you the balance in the base unit of the token.

Answer 2

Here's my getTRC20TokenBalance function, I hope it works for you:

import TronWeb from 'tronweb';
const tronWeb = new TronWeb({
    fullHost: 'https://api.trongrid.io',
    solidityNode: 'https://api.trongrid.io',
    eventServer: 'https://api.trongrid.io',
})
tronWeb.setAddress('TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t');

const tokenContractAddress = 'TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t'
const accountAddress = 'TJCxtgAMgVJ4E4ryzYsmMzD6qdJeDnZPHe'

const getTRC20TokenBalance = async (contractAddress, account) => {
    try {
        const accountHex = tronWeb.address.toHex(account)
        const contract = await tronWeb.contract().at(contractAddress)
        const balance = await contract.balanceOf(accountHex).call()
        return tronWeb.toDecimal(balance._hex)
    } catch (error) {
        console.error('Error al obtener el balance de USDT:', error);
        throw error;
    }
}

export async function GET(request) {
    const balance = await getTRC20TokenBalance(tokenContractAddress, accountAddress)
    return new Response(balance / 1000000, { headers: { 'Content-Type': 'application/json' } })
}