Securing Passwords in Node.js with Bcrypt

Node.js, a versatile platform for server-side programming, offers a range of libraries for enhancing security. One such library is bcrypt, a powerful tool for hashing and salting passwords. This article explores bcrypt’s features, installation, and practical usage in Node.js applications, ensuring your user passwords are securely stored and managed.

Understanding Bcrypt

Bcrypt is a password-hashing function designed to build a cryptographic hash of a password. It incorporates a salt—a random value—to safeguard against rainbow table attacks and ensures that each hashed password is unique. The primary features of bcrypt include:

  • Hashing Passwords: Converting plain text passwords into hashed formats, making them unreadable and secure.
  • Salting: Automatically generating a unique salt for each password to prevent hash collisions and rainbow table attacks.
  • Cost Factor: Allowing adjustment of the hashing process’s computational intensity, thus balancing between security and performance.

Installing Bcrypt in Node.js project


Install bcrypt with npm in your Node.js project:

npm install bcrypt

Implementing Bcrypt for password security

Hashing a password

To hash a password using bcrypt, follow these steps:

const bcrypt = require('bcrypt');
const saltRounds = 10; // Define the cost factor
async function hashPassword(password) {
    try {
        const hashedPassword = await bcrypt.hash(password, saltRounds);
        console.log('Hashed Password:', hashedPassword);
        return hashedPassword;
    } catch (error) {
// Example usage with a real password

Comparing a password with its Hash

To validate a user-entered password against a stored hash:

async function comparePasswords(inputPassword, storedHash) {
    try {
        const match = await, storedHash);
        if (match) {
            console.log('Passwords match!');
        } else {
            console.log('Incorrect password.');
    } catch (error) {
// Example usage
const storedHash = '$2b$10$N9qo8uLOickgx2ZMRZoMyeIjZAgcfl7p92ldbYiQa3/VwW/5CZ2zu'; // Replace with actual hash
comparePasswords('mySecurePassword123!', storedHash);

Best practices for using Bcrypt in Node.js

  • Appropriate Cost Factor: Adjust the cost factor according to your application’s performance requirements and security needs.
  • Never Store Plain Text Passwords: Always store the hashed version of passwords.
  • Regularly Update Hashing Strategy: Stay updated with security best practices and bcrypt updates.
  • Handle Errors Gracefully: Implement comprehensive error handling to manage potential issues in the hashing process.

Bcrypt is an essential tool for Node.js developers prioritizing user security. By implementing password hashing and salting with bcrypt, you significantly enhance the security of your application’s authentication system. This guide not only introduces bcrypt but also provides practical examples to integrate it into your Node.js applications effectively.

Author: user