burn_cw20.js

import { 
    LCDClient, 
    MsgExecuteContract, 
    MnemonicKey, 
    isTxError 
} from '@terra-money/terra.js';
import dotenv from 'dotenv';

dotenv.config();

const terra = new LCDClient({
    URL: process.env.NETWORK_URL,
    chainID: process.env.NETWORK_CHAIN_ID,
    gasAdjustment: 1.7,
    gasPrices: { uluna: 0.015 },
});

const mk = new MnemonicKey({
    mnemonic: process.env.MNEMO
})
const wallet = terra.wallet(mk);

console.log(wallet.key.accAddress);

const burn = new MsgExecuteContract(
    wallet.key.accAddress,
    process.env.TOKEN_ADDRESS,
    {
        "burn":
        {
            "amount": process.env.AMOUNT_TO_BURN,
        }
    }
)

const burningTx = await wallet.createAndSignTx({
    msgs: [burn],
    memo: process.env.TXNS_MNEMO
});

const burnRes = await terra.tx.broadcast(burningTx);

console.log(burnRes);

if (isTxError(burnRes)) {
    throw new Error(
        `instantiate failed. code: ${burnRes.code},
         codespace: ${burnRes.codespace},
         raw_log: ${burnRes.raw_log}`
    );
}

console.log("burning completed");