Node.js Backend Development Bootcamp · Pelajaran

Pendaftaran & Login Pengguna

Bangun fungsi pendaftaran dan login pengguna, termasuk hashing kata sandi dan penyimpanan kredensial yang aman.

Pendaftaran & Login Pengguna adalah pelajaran Node.js Backend Development Bootcamp gratis di CoddyKit. Ini adalah pelajaran 1 dari 6. Kamu bisa membaca pelajaran lengkapnya di bawah secara gratis — lalu praktikkan langsung di browser dengan editor kode bawaan dan tutor AI 24/7. Ini adalah bagian dari jalur belajar Node.js Backend Development Bootcamp, dan progresmu tersinkronisasi di web dan aplikasi CoddyKit. Kursus Node.js Backend Development Bootcamp mencakup 6 pelajaran total.

Bagian dari pelajaran ini belum diterjemahkan dan ditampilkan dalam bahasa Inggris.

Welcome to User Authentication

User authentication is how we verify who a user is. It's a critical part of almost any application that handles personal data or restricted features.

Why it matters: Protects user accounts and sensitive information.
What we'll cover: Building registration and login flows from scratch.

The User Registration Flow

Registering a new user involves several steps to create a new account:

User provides credentials (e.g., username, password, email).
Input data is validated (e.g., strong password, unique email).
The password is hashed for security.
New user data (including the hashed password) is saved to the database.

Why Hash Passwords?

Storing passwords in plain text is a huge security risk! If your database is breached, all user passwords would be exposed.

Hashing transforms a password into a fixed-size, unreadable string. It's a one-way process, meaning you can't easily get the original password back from the hash.

We use libraries like bcrypt in Node.js for robust password hashing, which also adds a 'salt' to prevent common attacks.

Hashing Passwords with bcrypt

bcrypt is a popular library for securely hashing passwords. It's computationally intensive, making brute-force attacks harder.

Try running this example to see a password hashed:

const bcrypt = require('bcrypt');

const password = "mySecretP@ssword";
const saltRounds = 10; // Cost factor for hashing (higher is slower/more secure)

async function hashPassword() {
  try {
    const hashedPassword = await bcrypt.hash(password, saltRounds);
    console.log("Original: " + password);
    console.log("Hashed: " + hashedPassword);
  } catch (error) {
    console.error("Error hashing:" + error.message);
  }
}

hashPassword();

Storing Hashed Credentials

After hashing, only the hashed password should be stored in your database, along with other user details like their email or username.

NEVER store plain-text passwords.
The hash is unique for each password, even if the original passwords are the same (thanks to salting).
This hash is what you'll use for comparison during login.

The User Login Flow

When a user tries to log in, your application follows these steps:

User provides their username/email and password.
Application retrieves the user's record (including their stored hashed password) from the database based on the username/email.
The provided password is hashed and compared against the stored hash.
If they match, the user is authenticated, and a session or token is created.

Verifying Passwords with bcrypt

To check if a user's provided password matches the stored hash, we use bcrypt.compare(). It performs the hashing and comparison securely.

Run this code to see password comparison in action:

const bcrypt = require('bcrypt');

// This hash would typically come from your database
const storedHash = "$2b$10$w090/qB2k6n0Y7o8p9q.u.0Z1X2Y3Z4A5B6C7D8E9F0G1H2I3J4K5L6M7N8O9P0Q1R"; 

const passwordAttempt = "mySecretP@ssword";
const wrongAttempt = "incorrectPassword";

async function comparePasswords() {
  try {
    const isMatch = await bcrypt.compare(passwordAttempt, storedHash);
    console.log(`'${passwordAttempt}' matches: ${isMatch}`);

    const isWrongMatch = await bcrypt.compare(wrongAttempt, storedHash);
    console.log(`'${wrongAttempt}' matches: ${isWrongMatch}`);
  } catch (error) {
    console.error("Error comparing:" + error.message);
  }
}

comparePasswords();

Secure Credential Storage Practices

Beyond just hashing passwords, other credentials need protection:

API Keys & Database URLs: Store these in environment variables (e.g., .env files), not directly in your code.
Sensitive User Data: Encrypt any highly sensitive data at rest in your database.
Regular Updates: Keep your hashing libraries and dependencies up-to-date.

Handling Authentication Errors

When registration or login fails, provide helpful but generic error messages to the user. This prevents revealing too much information to potential attackers.

Instead of 'User not found', say 'Invalid credentials'.
Instead of 'Password incorrect', also say 'Invalid credentials'.
Log detailed errors on the server side for debugging, but don't expose them to the client.

Quick Check: Password Hashing

Test your understanding of why password hashing is essential for security.

Recap: Registration & Login

In this lesson, you learned the fundamental steps for user registration and login:

We covered the importance of password hashing using bcrypt to protect sensitive user data.
You saw how to implement both the hashing for registration and the comparison for login.
We also touched on best practices for secure credential storage and handling authentication errors gracefully.

Next, we'll dive into implementing stateless authentication using JSON Web Tokens (JWTs).

Pertanyaan yang Sering Diajukan

Apakah pelajaran “Pendaftaran & Login Pengguna” gratis?

Ya — teks lengkap “Pendaftaran & Login Pengguna” gratis dibaca di sini di web. Untuk praktiknya secara interaktif (editor kode bawaan dan tutor AI 24/7) dan buka sisa kursus Node.js Backend Development Bootcamp, upgrade ke CoddyKit PRO. Kursus Node.js Backend Development Bootcamp mencakup 6 pelajaran total.

Apa yang akan aku pelajari di “Pendaftaran & Login Pengguna”?

Bangun fungsi pendaftaran dan login pengguna, termasuk hashing kata sandi dan penyimpanan kredensial yang aman. Kamu berlatih Node.js Backend Development Bootcamp dengan kode praktik yang langsung kamu jalankan di browser, dan tutor AI 24/7 menjawab pertanyaanmu saat kamu mengerjakan pelajaran ini.

Apakah aku perlu pengalaman untuk memulai Node.js Backend Development Bootcamp?

Tidak diperlukan pengalaman sebelumnya. Node.js Backend Development Bootcamp di CoddyKit dirancang untuk pemula hingga pelajar tingkat lanjut, jadi kamu bisa memulai di sini atau dari awal dan belajar sesuai kecepatan kamu sendiri. Ini adalah pelajaran 1 dari 6.

Berapa lama pelajaran “Pendaftaran & Login Pengguna” memakan waktu?

Sebagian besar pelajaran CoddyKit memakan waktu sekitar 5–10 menit. Setiap pelajaran ringkas dan interaktif, jadi kamu membuat kemajuan stabil dan melanjutkan dari tempat kamu tinggalkan di web dan aplikasi.

Bisakah aku menulis dan menjalankan kode dalam pelajaran Node.js Backend Development Bootcamp ini?

Ya. Setiap pelajaran Node.js Backend Development Bootcamp menyertakan editor kode bawaan, jadi kamu menulis dan menjalankan kode nyata langsung di browser dan mendapatkan umpan balik AI instan — tidak diperlukan penyiapan lokal.

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