Fungible Token

In this tutorial, we'll guide you through the process of working with Hedera Token Service (HTS) for fungible tokens using JavaScript scripts. These scripts cover essential operations such as creating a token, transferring tokens, increasing token supply, querying balance, updating token properties, deleting a token, and burning tokens.

Prerequisites

Before you start, make sure you have the following:

• Node.js installed on your machine.

• A Hedera Hashgraph account for testing purposes.

• Hedera JavaScript SDK installed in your project.

Step 1: Set Up Environment

1. Create a new directory for your project and navigate into it.

mkdir HederaTokenTutorial
cd HederaTokenTutorial

1. Initialize your Node.js project and install the necessary dependencies.

npm init -y
npm install @hashgraph/sdk dotenv

1. Create a .env file to store your Hedera account details.

MY_ACCOUNT_ID=your_account_id
MY_PRIVATE_KEY=your_private_key
OTHER_ACCOUNT_ID=another_account_id
OTHER_PRIVATE_KEY=another_private_key

Step 2: Write Token Creation Script

Create a file named createToken.js and add the script for token creation.

const {
    TokenCreateTransaction,
    Client,
    TokenType,
    TokenInfoQuery,
    AccountBalanceQuery, PrivateKey, Wallet
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

const otherAccountId = process.env.OTHER_ACCOUNT_ID;
const otherPrivateKey = PrivateKey.fromString(process.env.OTHER_PRIVATE_KEY);

if (otherAccountId == null ||
    otherPrivateKey == null ) {
    throw new Error("Environment variables otherAccountId and otherPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(myAccountId, myPrivateKey);

const adminUser = new Wallet(
    myAccountId,
    myPrivateKey
)

const supplyUser = new Wallet(
    otherAccountId,
    otherPrivateKey
)

async function main() {
    //Create the transaction and freeze for manual signing
    const transaction = await new TokenCreateTransaction()
        .setTokenName("Awesome Game Token")
        .setTokenSymbol("AGT")
        .setTokenType(TokenType.FungibleCommon)
        .setTreasuryAccountId(myAccountId)
        .setInitialSupply(2000)
        .setAdminKey(adminUser.publicKey)
        .setSupplyKey(supplyUser.publicKey)
        .freezeWith(client);

    //Sign the transaction with the client, who is set as admin and treasury account
    const signTx =  await transaction.sign(myPrivateKey);

    //Submit to a Hedera network
    const txResponse = await signTx.execute(client);

    //Get the receipt of the transaction
    const receipt = await txResponse.getReceipt(client);

    //Get the token ID from the receipt
    const tokenId = receipt.tokenId;

    console.log("The new token ID is " + tokenId);

    //Sign with the client operator private key, submit the query to the network and get the token supply

    const name = await queryTokenFunction("name", tokenId);
    const symbol = await queryTokenFunction("symbol", tokenId);
    const tokenSupply = await queryTokenFunction("totalSupply", tokenId);
    console.log('The total supply of the ' + name + ' token is ' + tokenSupply + ' of ' + symbol);

    //Create the query
    const balanceQuery = new AccountBalanceQuery()
        .setAccountId(adminUser.accountId);

    //Sign with the client operator private key and submit to a Hedera network
    const tokenBalance = await balanceQuery.execute(client);

    console.log("The balance of the user is: " + tokenBalance.tokens.get(tokenId));

    process.exit();
}

async function queryTokenFunction(functionName, tokenId) {
    //Create the query
    const query = new TokenInfoQuery()
        .setTokenId(tokenId);

    console.log("retrieveing the " + functionName);
    const body = await query.execute(client);

    //Sign with the client operator private key, submit the query to the network and get the token supply
    let result;
    if (functionName === "name") {
        result = body.name;
    } else if(functionName ==="symbol") {
        result = body.symbol;
    } else if(functionName === "totalSupply") {
        result = body.totalSupply;
    } else {
        return;
    }

    return result
}

main();

Step 3: Write Token Transfer Script

Create a file named transferToken.js and add the script for token transfer.

const {
    TransferTransaction,
    Client,
    TokenAssociateTransaction,
    Wallet,
    PrivateKey
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

const otherAccountId = process.env.OTHER_ACCOUNT_ID;
const otherPrivateKey = PrivateKey.fromString(process.env.OTHER_PRIVATE_KEY);

const tokenId = process.env.TOKEN_ID;

// If we weren't able to grab it, we should throw a new error
if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(myAccountId, myPrivateKey);

const wallet = new Wallet(
    otherAccountId,
    otherPrivateKey
);

async function main() {

    //  Before an account that is not the treasury for a token can receive or send this specific token ID, the account
    //  must become “associated” with the token.
    let associateOtherWalletTx = await new TokenAssociateTransaction()
        .setAccountId(wallet.accountId)
        .setTokenIds([tokenId])
        .freezeWith(client)
        .sign(otherPrivateKey)

    //SUBMIT THE TRANSACTION
    let associateOtherWalletTxSubmit = await associateOtherWalletTx.execute(client);

    //GET THE RECEIPT OF THE TRANSACTION
    let associateOtherWalletRx = await associateOtherWalletTxSubmit.getReceipt(client);

    //LOG THE TRANSACTION STATUS
    console.log(`- Token association with the users account: ${associateOtherWalletRx.status} \n`);

    //Create the transfer transaction
    const transaction = await new TransferTransaction()
        .addTokenTransfer(tokenId, client.operatorAccountId, -3)
        .addTokenTransfer(tokenId, wallet.accountId, 3)
        .freezeWith(client);

    //Sign with the sender account private key
    const signTx =  await transaction.sign(myPrivateKey);

    //Sign with the client operator private key and submit to a Hedera network
    const txResponse = await signTx.execute(client);

    //Request the receipt of the transaction
    const receipt = await txResponse.getReceipt(client);

    //Obtain the transaction consensus status
    const transactionStatus = receipt.status;

    console.log("The transaction consensus status " +transactionStatus.toString());

    process.exit();
}

main();

Step 4: Write Token Increase Supply Script

Create a file named increaseSupply.js and add the script for increasing token supply.

const {
    TokenMintTransaction,
    Client,
    TokenInfoQuery, PrivateKey
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const otherAccountId = process.env.OTHER_ACCOUNT_ID;
const otherPrivateKey = PrivateKey.fromString(process.env.OTHER_PRIVATE_KEY);

const tokenId = process.env.TOKEN_ID;

// If we weren't able to grab it, we should throw a new error
if (otherAccountId == null ||
    otherPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(otherAccountId, otherPrivateKey);

async function main() {
    //Create the transaction and freeze for manual signing
    const transaction = await new TokenMintTransaction()
        .setTokenId(tokenId)
        .setAmount(3000)
        .freezeWith(client);

    //Sign the transaction with the client, who is set as admin and treasury account
    const signTx =  await transaction.sign(otherPrivateKey);

    //Submit the signed transaction to a Hedera network
    const txResponse = await signTx.execute(client);

    //Request the receipt of the transaction
    const receipt = await txResponse.getReceipt(client);

    //Get the transaction consensus status
    const transactionStatus = receipt.status.toString();

    console.log("The transaction consensus status is " +transactionStatus);

    //Create the query
    const query = new TokenInfoQuery()
        .setTokenId(tokenId);

    //Sign with the client operator private key, submit the query to the network and get the token supply

    const name = await queryTokenFunction("name", tokenId);
    const symbol = await queryTokenFunction("symbol", tokenId);
    const tokenSupply = await queryTokenFunction("totalSupply", tokenId);
    console.log('The total supply of the ' + name + ' token is ' + tokenSupply + ' of ' + symbol);

    process.exit();
}

async function queryTokenFunction(functionName, tokenId) {
    //Create the query
    const query = new TokenInfoQuery()
        .setTokenId(tokenId);

    console.log(functionName);
    const body = await query.execute(client);

    //Sign with the client operator private key, submit the query to the network and get the token supply
    let result;
    if (functionName === "name") {
        result = body.name;
    } else if(functionName ==="symbol") {
        result = body.symbol;
    } else if(functionName === "totalSupply") {
        result = body.totalSupply;
    } else {
        return;
    }

    return result
}

main();

Step 5: Write Query Balance Script

Create a file named queryBalance.js and add the script for querying token balance.

const {
    Client,
    AccountBalanceQuery, PrivateKey, Wallet
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

const otherAccountId = process.env.OTHER_ACCOUNT_ID;
const otherPrivateKey = PrivateKey.fromString(process.env.OTHER_PRIVATE_KEY);

const tokenId = process.env.TOKEN_ID;

// If we weren't able to grab it, we should throw a new error
if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(myAccountId, myPrivateKey);

const walletUser = new Wallet(
    myAccountId,
    myPrivateKey
)

const walletOther = new Wallet(
    otherAccountId,
    otherPrivateKey
);

async function main() {

    const userWalletBalance = await  queryBalance(walletUser);
    const otherWalletBalance = await queryBalance(walletOther);

    console.log("The balance of the user is: " + userWalletBalance.tokens.get(tokenId));
    console.log("The balance of the other user is: " + otherWalletBalance.tokens.get(tokenId));

    process.exit();
}

async function queryBalance(user) {
    //Create the query
    const balanceQuery = new AccountBalanceQuery()
        .setAccountId(user.accountId);

    //Sign with the client operator private key and submit to a Hedera network
    const tokenBalance = await balanceQuery.execute(client);

    return tokenBalance;
}

main();

Step 6: Write Token Update Script

Create a file named updateToken.js and add the script for updating token properties.

const {
    TokenUpdateTransaction,
    Client,
    TokenInfoQuery, PrivateKey
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

const tokenId = process.env.TOKEN_ID;

// If we weren't able to grab it, we should throw a new error
if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(myAccountId, myPrivateKey);

async function main() {
    //Create the transaction and freeze for manual signing
    const transaction = await new TokenUpdateTransaction()
        .setTokenId(tokenId)
        .setTokenName("Bestest Game Token")
        .setTokenSymbol("BGT")
        .freezeWith(client);

    //Sign the transaction with the client, who is set as admin and treasury account
    const signTx =  await transaction.sign(myPrivateKey);

    //Submit the signed transaction to a Hedera network
    const txResponse = await signTx.execute(client);

    //Request the receipt of the transaction
    const receipt = await txResponse.getReceipt(client);

    //Get the transaction consensus status
    const transactionStatus = receipt.status.toString();

    console.log("The transaction consensus status is " +transactionStatus);

    //Create the query
    const query = new TokenInfoQuery()
        .setTokenId(tokenId);

    //Sign with the client operator private key, submit the query to the network and get the token supply

    const name = await queryTokenFunction("name", tokenId);
    const symbol = await queryTokenFunction("symbol", tokenId);
    const tokenSupply = await queryTokenFunction("totalSupply", tokenId);
    console.log('The total supply of the ' + name + ' token is ' + tokenSupply + ' of ' + symbol);

    process.exit();
}

async function queryTokenFunction(functionName, tokenId) {
    //Create the query
    const query = new TokenInfoQuery()
        .setTokenId(tokenId);

    console.log(functionName);
    const body = await query.execute(client);

    //Sign with the client operator private key, submit the query to the network and get the token supply
    let result;
    if (functionName === "name") {
        result = body.name;
    } else if(functionName ==="symbol") {
        result = body.symbol;
    } else if(functionName === "totalSupply") {
        result = body.totalSupply;
    } else {
        return;
    }

    return result
}

main();

Step 7: Write Token Deletion Script

Create a file named deleteToken.js and add the script for deleting a token.

const {
    Client,
    TokenDeleteTransaction,
    Wallet,
    PrivateKey
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

const tokenId = process.env.TOKEN_ID;

// If we weren't able to grab it, we should throw a new error
if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(myAccountId, myPrivateKey);

async function main() {

    //Create the transaction and freeze the unsigned transaction for manual signing
    const transaction = await new TokenDeleteTransaction()
        .setTokenId(tokenId)
        .freezeWith(client);

    //Sign with the admin private key of the token
    const signTx = await transaction.sign(myPrivateKey);

    //Submit the transaction to a Hedera network
    const txResponse = await signTx.execute(client);

    //Request the receipt of the transaction
    const receipt = await txResponse.getReceipt(client);

    //Get the transaction consensus status
    const transactionStatus = receipt.status;

    console.log("The transaction consensus status " +transactionStatus.toString());

    process.exit();
}

main();

Step 8: Write Token Burning Script

Create a file named burnToken.js and add the script for burning tokens.

const {
    Client,
    TokenBurnTransaction,
    PrivateKey
} = require("@hashgraph/sdk");
require('dotenv').config({ path: 'Token_Service/.env' });

const myAccountId = process.env.MY_ACCOUNT_ID;
const myPrivateKey = PrivateKey.fromString(process.env.MY_PRIVATE_KEY);

const otherPrivateKey = PrivateKey.fromString(process.env.OTHER_PRIVATE_KEY);

const tokenId = process.env.TOKEN_ID;

// If we weren't able to grab it, we should throw a new error
if (myAccountId == null ||
    myPrivateKey == null ) {
    throw new Error("Environment variables myAccountId and myPrivateKey must be present");
}

// Create our connection to the Hedera network
// The Hedera JS SDK makes this really easy!
const client = Client.forTestnet();

client.setOperator(myAccountId, myPrivateKey);

async function main() {

    //Burn 42 tokens and freeze the unsigned transaction for manual signing
    const transaction = await new TokenBurnTransaction()
        .setTokenId(tokenId)
        .setAmount(42)
        .freezeWith(client);

    //Sign with the supply private key of the token
    const signTx = await transaction.sign(otherPrivateKey);

    //Submit the transaction to a Hedera network
    const txResponse = await signTx.execute(client);

    //Request the receipt of the transaction
    const receipt = await txResponse.getReceipt(client);

    //Get the transaction consensus status
    const transactionStatus = receipt.status;

    console.log("The transaction consensus status " +transactionStatus.toString());

    process.exit();
}

main();

Step 9: Run the Scripts

Execute each script in the order of token creation, transfer, increase supply, query balance, update, delete, and burn. Ensure that you are following the proper sequence.

node createToken.js
node transferToken.js
node increaseSupply.js
node queryBalance.js
node updateToken.js
node deleteToken.js
node burnToken.js

Conclusion

Congratulations! You have successfully executed scripts for various Hedera Token Service operations for Fungible Tokens. This tutorial covers fundamental steps, and you can further explore advanced features and integrations based on your specific use case.