Node.js — Calculate a SHA512 Hash

Node.js has the built-in crypto module that allows you to calculate hashes. To calculate a hash, Node.js uses a bundled version of OpenSSL for cryptographic functions. You don’t have to interact with these cryptographic functions directly. The node:crypto module wraps OpenSSL’s features with a clean API.

One of the provided API’s methods is the createHash method. This tutorial walks you through the details of creating a SHA512 hash using the features given by Node.js.

Node.js Series Overview

  1. String Replace All Appearances
  2. Remove All Whitespace From a String in JavaScript
  3. Generate a Random ID or String in Node.js or JavaScript
  4. Remove Extra Spaces From a String in JavaScript or Node.js
  5. Remove Numbers From a String in JavaScript or Node.js
  6. Get the Part Before a Character in a String in JavaScript or Node.js
  7. Get the Part After a Character in a String in JavaScript or Node.js
  8. How to Check if a Value is a String in JavaScript or Node.js
  9. Check If a String Includes All Strings in JavaScript/Node.js/TypeScript
  10. Check if a Value is a String in JavaScript and Node.js
  11. Limit and Truncate a String to a Given Length in JavaScript and Node.js
  12. Split a String into a List of Characters in JavaScript and Node.js
  13. How to Generage a UUID in Node.js
  14. Reverse a String in JavaScript or Node.js
  15. Split a String into a List of Lines in JavaScript or Node.js
  16. Split a String into a List of Words in JavaScript or Node.js
  17. Detect if a String is in camelCase Format in Javascript or Node.js
  18. Check If a String Is in Lowercase in JavaScript or Node.js
  19. Check If a String is in Uppercase in JavaScript or Node.js
  20. Get the Part After First Occurrence in a String in JavaScript or Node.js
  21. Get the Part Before First Occurrence in a String in JavaScript or Node.js
  22. Get the Part Before Last Occurrence in a String in JavaScript or Node.js
  23. Get the Part After Last Occurrence in a String in JavaScript or Node.js
  24. How to Count Words in a File
  25. How to Shuffle the Characters of a String in JavaScript or Node.js
  26. Append Characters or Words to a String in JavaScript or Node.js
  27. Check if a String is Empty in JavaScript or Node.js
  28. Ensure a String Ends with a Given Character in JavaScript or Node.js
  29. Left-Trim Characters Off a String in JavaScript or Node.js
  30. Right-Trim Characters Off a String in JavaScript or Node.js
  31. Lowercase the First Character of a String in JavaScript or Node.js
  32. Uppercase the First Character of a String in JavaScript or Node.js
  33. Prepend Characters or Words to a String in JavaScript or Node.js
  34. Check if a String is a Number
  35. Convert a String to Buffer

Hash a Value in Node.js Using SHA512

The Node.js createHash(algorithm) method creates and returns a Hash instance. You must provide an algorithm to generate hash digests. You may have a look at our tutorial here on Future Studio showing you how to retrieve the list of supported hash algorithms.

Here’s a code snippet calculating a SHA512 hash of a given content value:

import { createHash } from 'node:crypto'

/**
 * Returns a SHA512 hash using SHA-2 for the given `content`.
 *
 * @see https://en.wikipedia.org/wiki/SHA-2
 * 
 * @param {String} content
 *
 * @returns {String}
 */
function sha512(content) {  
  return createHash('sha512').update(content).digest('hex')
}

We’re using Node.js v20 to write this tutorial. Node.js v20 uses SHA-2 (Secure Hash Algorithm 2) to calculate the hash digest. The security community considers SHA-2 as secure at the time of writing this tutorial.

Hash Output Formats

The code snippet encodes the hash to “hex” format by calling .digest('hex'). You can also encode the hash value in the following formats:

  • base64
  • base64url
  • binary
  • hex

Using SHA3-512 to Calculate a Hash

Besides SHA-2, there’s the SHA-3 hash algorithm as the latest member of the Secure Hash Algorithm family. The original name of SHA-3 was “Keccak”. The Keccak algorithm is the winner in the NIST hash function competition.

You can calculate SHA-3 hashes with Node.js too. OpenSSL supports SHA512 hash using the SHA-3 hash algorithm. Use the sha3-512 hash algorithm when creating a hash instance and you’re good to go:

import { createHash } from 'node:crypto'

/**
 * Returns a SHA512 hash using SHA-3 for the given `content`.
 *
 * @see https://en.wikipedia.org/wiki/SHA-3
 *
 * @param {String} content
 *
 * @returns {String}
 */
function sha512(content) {  
  return createHash('sha3-512').update(content).digest('hex')
}

Enjoy SHA512 hashing in Node.js!

PS: Here’s an interesting read on StackOverflow outlining the differences between SHA-2 and SHA-3.


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