Through the use of an algorithm, the **`crypto.createHash()` method** creates a Hash object that is then used to create hash digests. Examples of the algorithm it takes as input are `'sha256'`, `'sha512'`.

const crypto = require('crypto')

const code = 'Hello World'

const Hash = crypto.createHash('sha256', code)
    .update('How are you?')
    .digest('hex')

console.log(Hash)


The crypto module is imported from NodeJS. `crypto.createHash()` takes in two arguments: 1) the algorithm, and 2) the data that needs to be hashed.

The `update` method works with the `digest` method to push data to later be turned into a hash. 

The **`update` method** can be called multiple times to ingest streaming data, such as buffers from a file read stream. The argument for the **`digest` method** represents the output format, and may either be "hex","binary" or "base64". It defaults to binary.

This is used for security purposes like user authentication, in which we are storing the password in a database in the encrypted form by encryption and decryption.

What is the Node crypto.createHash() method?

The crypto.createHash() method in NodeJS generates hash digests using algorithms like 'sha256' for security tasks such as encrypting passwords.