Using SHA-256 with NodeJS Crypto

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I'm trying to hash a variable in NodeJS like so:

var crypto = require('crypto');

var hash = crypto.createHash('sha256');

var code = 'bacon';

code = hash.update(code);
code = hash.digest(code);


But looks like I have misunderstood the docs as the console.log doesn't log a hashed version of bacon but just some information about SlowBuffer.

What's the correct way to do this?


const hash = crypto.createHash('sha256').update(pwd).digest('base64');



Crypto, Use require('crypto') to access this module. const crypto = require('crypto'); const secret = 'abcdefg'; const hash = crypto.createHmac('sha256', secret) .update('I� Which node version are you using ? For #1 I had to move const hash = crypto.createHash('sha256'); inside your for loop (instance not reusable). For #2, you have a typo sha1256 to sha256 – Bertrand Martel Jun 30 '17 at 22:36

Similar to the answers above, but this shows how to do multiple writes; for example if you read line-by-line from a file and then add each line to the hash computation as a separate operation.

In my example, I also trim newlines / skip empty lines (optional):

const {createHash} = require('crypto');

// lines: array of strings
function computeSHA256(lines) {
  const hash = createHash('sha256');
  for (let i = 0; i < lines.length; i++) {
    const line = lines[i].trim(); // remove leading/trailing whitespace
    if (line === '') continue; // skip empty lines
    hash.write(line); // write a single line to the buffer

  return hash.digest('base64'); // returns hash as string

I use this code ensure generated lines of a file aren't edited by someone manually. To do this, I write the lines out, append a line like sha256:<hash> with the sha265-sum, and then, upon next run, verify the hash of those lines matches said sha265-sum.

Using SHA-256 with NodeJS Crypto, There a few JavaScript implementation of the SHA-256 hash function out there. But the easiest is usually to use Node's built in cryptography� (Node.js) JWS Using RSASSA-PSS using SHA-256 and MGF1 with SHA-256 Creates and validates a JSON Web Signature (JWS) using RSASSA-PSS using SHA-256 and MGF1 with SHA-256. Chilkat supports all of the following JWS algorithms:

nodejs (8) ref

const crypto = require('crypto');
const hash = crypto.createHash('sha256');

hash.on('readable', () => {
    const data =;
    if (data) {
        // Prints:
        //  6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50

hash.write('some data to hash');

SHA-256 in Node, npm install --save sha256. Note: when Node.js is detected, the Node Crypto component is used instead of re-implementing the SHA256 hash� Im Storing SHA256 hashes of user passwords in my database generated by .NET and I need to be able to check them with Node.js. The only problem is that .NET and Node.js create different hashes for the

sha256, nodejsera, node.js, hmac, generate hmac using node.js, crypto module of node.js , Generate a simple hmac using sha256 hashing algorithm and node.js,� #crypto; #md5; #node.js; #sha1; #sha256; #sha512; How to Generate md5, sha1, sha512, sha256 checksum hashes in Node.js # Checksums in Node.js are generated using the crypto library's createHash() method. The usage format is this: crypto.createHash(algo); Where algo is the algorithm of your choice - md5, sha1, sha512, sha256 etc. The algorithms

HMAC using sha256 algorithm in node.js, The Node.js documentation has a pretty good example showing how to make a sha256 CLI. Those looking for a more compact function can use the following. createHash('sha256'); sum.update(file_buffer); const hex = sum.digest('hex');� This article will explain you to salt hash passwords using Node.js Crypto. Here we’ll not go into details comparing the pros and cons of different ways of storing passwords, rather we’ll see how we can implement salt hashing mechanism for storing passwords in NodeJS.

NodeJS, iterations: iterations, hasher: crypto.algo.SHA256. How to use. SHA256. function. in. crypto-js static hash(data) { return SHA256(JSON.stringify(data)). SHA256 HMAC in different languages (both hex & base64 encoding) - danharper/hmac-examples

  • What this digest does ?
  • Here are examples from projects for doing md5 hashing - replace 'md5' with 'sha256' to get what you need.
  • Does this answer your question? node.js hash string?
  • //to get in hex: crypto.createHash('sha256').update('password').digest('hex');
  • Don't hash passwords with sha256? Look up bcrypt or something similar.