This is a playground to test JavaScript. It runs a completely standard copy of Node.js on a virtual server created just for you. Every one of npm’s 300,000+ packages are pre-installed, so try it out:
const EC = require('elliptic').ec;
const SHA256 = require('js-sha256').sha256;
const RIPEMD160 = require('ripemd160');
const BASE58CHECK = require('base58check');
const BA = require('binascii');
const EC_INSTANCE = new EC('secp256k1');
const KEY_PAIR = EC_INSTANCE.genKeyPair();
const NETWORK = "37";
const privateKey = KEY_PAIR.getPrivate('hex');
const key = BA.unhexlify(KEY_PAIR.getPublic('hex'));
const keyHash = NETWORK + new RIPEMD160().update(SHA256(key)).digest('hex');
const checksum = SHA256(SHA256(keyHash)).substr(0, 4);
const address = BASE58CHECK.encode(keyHash + checksum);
// Output generated address/priv. key
console.log(`Address (Wallet): ${address} (length: ${address.length})`);
console.log(`Private Key: ${privateKey}`);
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