Comparing User Passwords with Hash Passwords in Node.js Using bcrypt

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Understanding the Problem

When users change their passwords, we want to allow them to select a new one while preventing them from reusing old passwords for security reasons. This involves comparing the new password against a list of previously used hashed passwords. Since passwords are typically stored in a hashed format (to enhance security), straightforward string comparisons won’t suffice. We need to use hashing verification methods to check for matches.

The Solution

The solution involves a few steps. We will create an asynchronous function to loop through the array of hashed passwords, comparing each hash with the provided password. If a match is found, we will indicate that the password has been reused.

Let's break down the solution into organized sections:

Step 1: Importing Required Libraries

Make sure you have the bcrypt library installed in your project to handle the password hashing and comparisons. If you haven't already, you can install it using:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Creating the Password Comparison Function

Here’s how the function is defined:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Implementing the Function in Code

Now that we have the comparison function, we can use it to evaluate if the new incoming password has been used before. Here’s how you can implement it:

[[See Video to Reveal this Text or Code Snippet]]

Summary

By following the steps outlined above, we can successfully check if a user is attempting to reuse a password that has already been used. This approach leverages the security provided by password hashing (with bcrypt) and ensures that we maintain good security practices in handling user credentials.

Conclusion

If you have any thoughts or questions about this implementation, feel free to leave a comment below!