Retrieve Solana Token Balance with JavaScript

Solana

Anchor Framework

Javascript

Fetch Solana token balance using JavaScript with '@solana/web3.js', providing connection details, public key, and token mint address.

import { Connection, PublicKey, Token } from '@solana/web3.js'; async function getTokenBalance(connection, publicKey, tokenMintAddress) { const token = new Token(connection, tokenMintAddress, null); const balance = await token.getBalance(publicKey); return balance; } const connection = new Connection("https://api.mainnet-beta.solana.com", { commitment: "processed", }); const publicKey = new PublicKey("YourPublicKeyHere"); const tokenMintAddress = new PublicKey("TokenMintAddressHere"); getTokenBalance(connection, publicKey, tokenMintAddress).then(balance => { console.log("Token balance:", balance.toString()); }).catch(error => { console.error("Error:", error); });

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This code snippet is designed to retrieve the balance of a specific token for a given public key on the Solana blockchain using JavaScript and the @solana/web3.js library. It defines an asynchronous function getTokenBalance that takes a Connection object, a PublicKey for the wallet of interest, and a PublicKey for the token mint address. It uses these to create a Token object and calls its getBalance method to fetch the token balance. The balance is then logged to the console.

Detailed Explanation:

Importing Necessary Classes: The snippet starts by importing Connection, PublicKey, and Token classes from @solana/web3.js. These are essential for interacting with the Solana blockchain.
- Connection: Used to establish a connection with the Solana blockchain.
- PublicKey: Represents public keys on the Solana blockchain.
- Token: A class representing a token on the Solana blockchain, allowing for operations such as fetching balances.
The getTokenBalance Function:
- It is an asynchronous function, indicating operations within it may not complete instantly.
- Takes three parameters: connection (an instance of Connection), publicKey (instance of PublicKey for the wallet), and tokenMintAddress (instance of PublicKey for the token's mint address).
- Inside, it creates a new Token instance using the provided connection, tokenMintAddress, and null for the programId (assuming the default token program).
- It then awaits the result of the getBalance method called on the Token instance, passing the publicKey.
- Finally, it returns the balance.
Establishing a Connection:
- A new Connection is created with the URL of the Solana mainnet beta cluster and a commitment level of "processed". This sets the level of confirmation the node should consider a transaction to be finalized.
Defining Public Keys:
- Two PublicKey instances are created, one for the user's public key and another for the token mint address. These are placeholders and should be replaced with actual public key strings.
Executing the Function:
- The getTokenBalance function is called with the connection, publicKey, and tokenMintAddress. It returns a promise that resolves with the balance.
- .then() is used to handle the resolved promise, logging the balance to the console.
- .catch() is used to catch and log any errors that occur during the execution.

Conclusion: This code is a straightforward example of how to fetch a token's balance for a specific wallet on the Solana blockchain using JavaScript. It leverages the @solana/web3.js library to interact with the blockchain, making it a useful snippet for developers working on Solana-based applications requiring balance checks.

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