const bs58 = require('bs58');
const fs = require('fs');

// Paste your base58 private key string here
const base58 = process.argv[2];
if (!base58) {
  console.error('Usage: node convert.js <base58key>');
  process.exit(1);
}
const arr = Array.from(bs58.decode(base58));
console.log(JSON.stringify(arr));