get file hash from buffer in javascript

const crypto = require('crypto');

// create a buffer with file contents
const fileBuffer = Buffer.from('Hello World!');

// create a hash instance
const hash = crypto.createHash('sha256');

// update the hash with file contents
hash.update(fileBuffer);

// get the calculated hash digest
const fileHash = hash.digest('hex');

console.log(fileHash); // should output: 943a702d06f34599aee1f8da8ef9f7296031d699e7eb8a63d1c1f3affefe2c24
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