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Interacting with Solana Contracts from a Node.js Client: Passing Strings as Bytes and Tokens to My

As a developer working on smart contracts for the Solana blockchain, you probably know the challenges of interacting with external programs or services. A common requirement is to pass data between the contract and an external client, such as a Node.js application. In this article, we will explore how to pass strings as bytes into a Solang contract using a Node.js client and generate tokens from the same client.

Prerequisites

Before diving into the code, make sure you have:

• Solana Node installed on your computer.

• Solang contract deployed on the mainnet with permissions to read from the repository.

• A Node.js application installed on your local computer (we will use Express.js as an example).

Node.js Client Setup

First, create a new Express.js project and install the necessary dependencies:

npm init -y
npm install express solana-typescript-sdk @types/solana-transaction-sdk @types/solana-txpool @types/solana-token-mints

Create a new file named index.js and add the following code to configure the client:

const { createClient } = require('solana-websocket-client');
const solanaTypes = require('@types/solana-typescript-sdk');
const TokenMints = require('@types/solana-token-mints');
// Set your Solana network and account credentials here
const SOLANA_NETWORK = 'devnet';
const ACCOUNT_ID = 'your-solana-account-id';
const PRIVATE_KEY = 'your-private-key';
// Create a new Solana client instance
async function createClient() {
const solana = require('solana-websocket-client');
return solana.connect({
network: SOLANA_NETWORK,
accounts: [
{id: ACCOUNT_ID, public key: ACCOUNT_ID},
// Add your Solana account credentials here
],
keypair: {
key: PRIVATE_KEY,
path: 'path/to/your/key',
},
});
}
modulo.esports = createClient;

This code sets up a new Solana client instance using the connect method. You will need to replace SOLANA_NETWORK, ACCOUNT_ID, and PRIVATE_KEY with your actual Solana network, account ID, and private key.

Passing strings as bytes

Now that you have a client instance up and running, let’s pass a string in bytes from the client to the contract. Create a new file called “contract.js” and add the following code:

const { Connection } = require('@solana/web3-adapter');
// Set your Solang connection and account credentials here
constant connection = new solanaWebsocketClient({
network: SOLANA_NETWORK,
accounts: [
{id: ACCOUNT_ID, public key: ACCOUNT_ID},
],
});
async function mintTokens() {
const transaction = await connection.createTransaction({
Author ID:ACCOUNT_ID,
maxOutputSize: 1000, // adjust the output size to your needs
});
await connection.sendTransaction(transaction);
consttransactionPool = await connection.getPoolTransactions();
const poolTxid = transactionPool[0].txId;
return poolTxid;
}
modulo.esports = mintTokens;

This code creates a new transaction and sends it to the Solang network using the client instance. It then retrieves the pool transactions for that transaction ID and returns the transaction ID of the transaction pool.

Minting coins

To extract tokens from this pool transaction, you will need to create a function that takes an address as input, extracts the pool transaction ID, creates a new transaction and sends it to the Solang network. Create a new file called tokenMint.js and add the following code:

“`javascript

async function tokenize(minterAddress) {

constant transaction = await connection.

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