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Prerequisites

Install packages in your working directory:
npm install @lightprotocol/stateless.js@alpha \
            @lightprotocol/compressed-token@alpha
Install the CLI globally:
npm install -g @lightprotocol/zk-compression-cli@alpha

# start local test-validator in a separate terminal
light test-validator
In the code examples, use createRpc() without arguments for localnet.
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Mint Compressed Tokens

// 1. Load wallet and connect to Localnet
// 2. Create SPL mint with token pool for compression via createMint()
// 3. Mint compressed tokens to recipient account via mintTo()
// 4. Verify compressed token balance via getCompressedTokenAccountsByOwner

import { createRpc } from "@lightprotocol/stateless.js";
import { createMint, mintTo } from "@lightprotocol/compressed-token";
import { Keypair } from "@solana/web3.js";
import { readFileSync } from "fs";
import { homedir } from "os";

// Step 1: Load wallet from filesystem
const payer = Keypair.fromSecretKey(
  new Uint8Array(JSON.parse(readFileSync(`${homedir()}/.config/solana/id.json`, "utf8")))
);

// Connect to local test-validator
const RPC_ENDPOINT = "http://localhost:8899";
const COMPRESSION_ENDPOINT = "http://localhost:8784";
const PROVER_ENDPOINT = "http://localhost:3001";
const connection = createRpc(RPC_ENDPOINT, COMPRESSION_ENDPOINT, PROVER_ENDPOINT);

const main = async () => {
  try {
    // Step 2: Create SPL mint with token pool for compression
    console.log("\nCreating SPL mint with token pool for compression");
    const { mint, transactionSignature } = await createMint(
      connection,
      payer,
      payer.publicKey, // mintAuthority
      9
    );

    console.log(`Mint address: ${mint.toBase58()}`);
    console.log(
      `Create mint transaction: https://explorer.solana.com/tx/${transactionSignature}?cluster=custom&customUrl=http://localhost:8899`
    );

    // Step 3: Mint compressed tokens to recipient account
    console.log("\nMinting compressed token...");
    const mintAmount = 1000000000; // mintAmount with decimals
    const mintToTxId = await mintTo(
      connection,
      payer,
      mint, // SPL mint with token pool for compression
      payer.publicKey, // recipient.publicKey
      payer, // mintAuthority
      mintAmount
    );

    console.log(`Compressed Token minted ${mintAmount / 1e9} token`);
    console.log(
      `Transaction: https://explorer.solana.com/tx/${mintToTxId}?cluster=custom&customUrl=http://localhost:8899`
    );

    // Step 4: Verify compressed token balance via getCompressedTokenAccountsByOwner
    const tokenAccounts = await connection.getCompressedTokenAccountsByOwner(
      payer.publicKey,
      { mint } // SPL mint with token pool for compression
    );
  } catch (error: any) {
    console.error("Error:", error.message);
  }
};

main().catch(console.error);

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Next Steps

Learn more about compressed tokens.