Generate X Polkadot/Substrate Accounts

main.ts

import { Keyring } from "npm:@polkadot/ui-keyring";
import { cryptoWaitReady } from "https://deno.land/x/polkadot@0.2.45/util-crypto/crypto.ts";
import { mnemonicGenerate } from "https://deno.land/x/polkadot@0.2.45/util-crypto/mnemonic/index.ts";

// generate a random mnemonic, 12 words in length
const MNEMONIC = mnemonicGenerate(12);
console.log(MNEMONIC);

cryptoWaitReady().then(async () => {
  // load all available addresses and accounts;
  const new_keyring = new Keyring();

  new_keyring.loadAll({ type: "sr25519" });

  console.log("Generating 32 accounts...");
  // Generate 32 account using 32 different derivation paths
  for (let i = 0; i < 32; i++) {
    const pair = new_keyring.createFromUri(`${MNEMONIC}//${i}`, {
      name: `account${i}`,
    });
    new_keyring.addPair(pair, "qwerty");
    console.log(pair.address);
  }

  // backup all account
  const addresses: string[] = new_keyring.getAccounts().map((account) =>
    account.address
  );

  console.log(addresses.length);

  const accounts = await new_keyring.backupAccounts(addresses, "qwerty");

  // save the accounts to a file
  const accountsJson = JSON.stringify(accounts);
  Deno.writeFileSync("accounts.json", new TextEncoder().encode(accountsJson));
});