A quick way for hashing passwords using Bcrypt with Nodejs

Let’s see how we can use it in our Node.js application.

Before we use it, let’s first have a look at some terms.

Salt Rounds: This is the cost factor that indicates the amount of time needed to calculate a single bcrypt hash. Higher the salt rounds, the more hashing rounds are done, hence the time and difficulty is increased while brute-forcing. For example, a cost factor of n means that the calculation will be done 2^n times.

So, there are two ways to hash a password:

Now if we want to compare the password entered by the user with the previously stored password hash, we can easily compare it.

Both the ways mentioned above can also be achieved with promises, these methods (hash & compare) will return a Promise when a callback is not defined.

Bcrypt also provides methods like genSaltSync, HashSync and CompareSync to perform synchronously. However, aysnc methods are preferred because of the fact that hashing done by bcyrpt is CPU intensive, so the sync methods will block event loop and our application will not serve any other request until the sync methods are completed executed.

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