solana-program-library-memo

memo-exmaple.js

const {
  Keypair,
  Transaction,
  TransactionInstruction,
  PublicKey,
  Connection,
  sendAndConfirmTransaction,
  LAMPORTS_PER_SOL,
} = require("@solana/web3.js");

const sendMemo = async (conn, account) => {
  const instruction = new TransactionInstruction({
    keys: [{
      pubkey: account.publicKey,
      isSigner: true,
      isWritable: true
    }],
    programId: new PublicKey("Memo1UhkJRfHyvLMcVucJwxXeuD728EqVDDwQDxFMNo"),
    data: Buffer.from("solana memo node.js test"),
  });

  return await sendAndConfirmTransaction(
    conn,
    new Transaction().add(instruction),
    [account],
    {
      commitment: "confirmed",
    }
  )
};

(async () => {
  const conn = new Connection("https://api.devnet.solana.com");
  const account = new Keypair();
  const sig1 = await conn.requestAirdrop(account.publicKey, LAMPORTS_PER_SOL);
  await conn.confirmTransaction(sig1);
  console.log("airdrop done");
  console.log("account: ", account.publicKey.toBase58());
  const sig = await sendMemo(conn, account);
  console.log('sig: ', sig);

})().catch(console.error);

It seems to me here keys: [], it will need to be a keys, not just a empty array.

@alexandr-kazakov

This code is a note I wrote as test code when I was a Solana beginner. When I look at it now, I see deprecated and strange things. You are right, keys is needed. Fixed.

By the way, you can use my solana-suite library to implement the memo function more simply, if you want.