This gist describes how to encode password with salt using SHA256 algorithm. It shows how to do it with google crypto-js library and Node.js module crypto

encryptPasswordUsingNodeJsCrypto.js

var crypto = require('crypto');
var passowrd = "123";
var salt = "test@gmail.com";

passowrd = crypto.createHash('sha256')
        .update(passowrd, "utf8")
        .update(makeHash(salt))
        .digest("base64");

console.log(passowrd);

function makeHash(val) {
    return crypto.createHash('sha256').update(val, "utf8").digest();
}

encryptPassWordWithCryptoJs.js

var CryptoJS = require('crypto-js');

var algo = CryptoJS.algo.SHA256.create();
algo.update(password, 'utf-8');
algo.update(CryptoJS.SHA256(salt), 'utf-8');
var hash = algo.finalize().toString(CryptoJS.enc.Base64);
console.log(hash);