bintools_create_key.js

const avalanche = require("avalanche");
let bintools = avalanche.BinTools.getInstance();
const ID = 1; 
const ava = new avalanche.Avalanche("api.avax-test.network", 443, "https", networkID);
const xchain = ava.XChain();
let xKeychain = xchain.keyChain();
let keypair = xKeychain.makeKey();

//p ublic and private keys
let pubkstr = keypair.getPublicKeyString();
let privkstr = keypair.getPrivateKeyString(); 
console.log(pubkstr);

// decode private key
const decoded = bintools.cb58Decode(privkstr.split('-')[1]);
console.log(`0x${decoded.toString('hex')}`)