NodeJS Password Hashing

In this tutorial, we'll dive into the important topic of password hashing. Password hashing is a crucial step in securing user passwords and protecting sensitive data in your Node.js applications. So, let's get started and learn how to implement password hashing to safeguard user passwords!

Understanding Password Hashing

Storing user passwords securely is of utmost importance to protect user accounts from unauthorized access. Password hashing is a technique that transforms user passwords into a non-reversible and encrypted form before storing them in a database. This ensures that even if the database is compromised, the original passwords remain hidden.

In this tutorial, we'll use the popular bcrypt library to demonstrate password hashing in Node.js. Bcrypt is widely used for its security features and its ability to generate strong, one-way hashes.

Step 1:

Install the bcrypt package by running the following command in your Node.js project:

Now, let's dive into the implementation of password hashing.

Hashing Passwords with Bcrypt

Step 1:

In your Node.js file, require the bcrypt library at the top:

Step 2:

Generate a salt to enhance the security of the hashing process. The salt is a random value used as an additional input to the password hashing function. It ensures that even if two users have the same password, their hashes will be different.

In this example, we use bcrypt.genSalt() to generate a salt with a specified number of rounds (in this case, 10). The higher the number of rounds, the more time it takes to hash the password but the more secure it becomes.

Step 3:

Hash the user's password using the generated salt:

In this step, we use bcrypt.hash() to generate the hash from the user's plain password and the generated salt. The resulting hash can be stored in a database or used for further authentication.

Verifying Passwords

To verify a password, you compare the user's entered password with the stored hash.

Step 1:

Retrieve the stored hash from the database or wherever it was stored.

Step 2:

Compare the stored hash with the user's entered password:

In this example, we use to compare the entered password with the stored hash. If the result is true, the passwords match and the authentication can proceed. Otherwise, the passwords do not match, and you can handle the invalid password scenario accordingly.

There you go! You've successfully learned how to implement password hashing in Node.js using the bcrypt library. By incorporating password hashing into your applications, you can ensure that user passwords are stored securely and protect sensitive data.

Remember to follow security best practices by using strong salts, generating unique salts per user, and choosing an appropriate number of salt rounds to balance security and performance.

Additionally, consider implementing other security measures like password policies, multi-factor authentication, and secure session management to further enhance the overall security of your applications.

Now that you have the knowledge to safeguard user passwords through password hashing, go ahead and build secure and trustworthy applications that instill confidence in your users.


Commonly used cryptographic hash functions for password hashing in Node.js include bcrypt, Argon2, and scrypt. These functions are designed to be slow and resource-intensive, making them difficult to crack using brute-force or dictionary attacks.

Salting is the practice of adding random data (a "salt") to a password before hashing it. Salting enhances security by making it more difficult to use precomputed tables (rainbow tables) to crack passwords. Most modern password hashing libraries handle salting automatically.

Yes, password hashing is just one part of a comprehensive security strategy. You can enhance security by implementing other measures like authentication, authorization, and using HTTPS to encrypt data in transit.