Derive near keys from seed

near_derivation.js

const bip32 = require('ed25519-hd-key');
const nacl = require('tweetnacl');
const bip39 = require('bip39');
const bs58 = require('bs58')

const path = "m/44'/397'/0'"
const mnemonic = 'test test test test test test test test test test junk';
const seed = bip39.mnemonicToSeedSync(mnemonic);

const keySeed = bip32.derivePath(path, seed).key;

const { publicKey, secretKey } = nacl.sign.keyPair.fromSeed(keySeed);
const privateKeyHex = Buffer.from(secretKey).toString('hex');
const privateKeybs58= bs58.encode(secretKey);
const publicKeyHex = Buffer.from(publicKey).toString('hex');
const publicKeybs58 = bs58.encode(publicKey);

console.log(`Key (hex): ${privateKeyHex}`);
console.log(`Key (bs58): ${privateKeybs58}`);
console.log(`Public Key (hex): ${publicKeyHex}`);
console.log(`Public Key (bs58): ${publicKeybs58}`);