https://www.npmjs.com/package/bcrypt

try_bcrypt.js

var bcrypt = require('bcrypt');
const saltRounds = 10;
const myPlaintextPassword = 's0/\/\P4$$w0rD';
const someOtherPlaintextPassword = 'not_bacon';

// Hash a password

bcrypt.genSalt(saltRounds, function(err, salt) {
    bcrypt.hash(myPlaintextPassword, salt, function(err, hash) {
        console.log('> hash a password (generate a salt and hash on separate function calls)');
        console.log(myPlaintextPassword);
        console.log(salt);
        console.log(hash);  // save as hash1
    });
});

bcrypt.hash(myPlaintextPassword, saltRounds, function(err, hash) {
    console.log('> hash a password (auto-gen a salt and hash)');
    console.log(myPlaintextPassword);
    console.log(hash);  //  save as hash2
});

// Check a password

var hash1 = "$2b$10$0B3SxKpaaPr.j9LXOcUdPOc.6V6bAe1SBeUdap9Y0vmiNPFDAenJS";
var hash2 = "$2b$10$Hb63I0ICt.EtAdzWPMNkS./TD8pKZVDrcJNas5P/cgikPn6M9f9ve";

bcrypt.compare(myPlaintextPassword, hash1, function(err, res) {
    console.log('> check hash1');
    console.log(myPlaintextPassword);
    console.log(hash1);
    console.log(res);  // return true
});

bcrypt.compare(myPlaintextPassword, hash2, function(err, res) {
    console.log('> check hash2');
    console.log(myPlaintextPassword);
    console.log(hash2);
    console.log(res);  // return true
});

bcrypt.compare(someOtherPlaintextPassword, hash2, function(err, res) {
    console.log('> check hash2 (wrong password)');
    console.log(someOtherPlaintextPassword);
    console.log(hash2);
    console.log(res);  // return false
});