Make a bitcoin address and WIF

index.js

var bitcoin = require('bitcoinjs-lib')
var fs = require("fs")

function randomString(length, chars) {
    var result = '';
    for (var i = length; i > 0; --i) result += chars[Math.floor(Math.random() * chars.length)];
    return result;
}

function makePair(params) {
    var rand = randomString(32, '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ');
    function rng () { return new Buffer(rand) }
    var keyPair = bitcoin.ECPair.makeRandom({ rng: rng })
    var address = keyPair.getAddress();
    var wif = keyPair.toWIF();
    console.log('Address: '+address);
    console.log('WIF: '+wif);
}

(function () {
        makePair();
})();

package.json

{
  "name": "KeyPair",
  "version": "1.0.0",
  "description": "Make a bitcoin address and WIF",
  "main": "index.js",
  "scripts": {
    "start": "nodemon index.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Will In China @bkawk",
  "license": "MIT",
  "dependencies": {
    "bitcoinjs-lib": "^2.2.0"
  }
}