generate a random byte string with node's crypto.randomBytes

randomHashGenerator.js

const crypto = require('crypto');

let bytes = crypto.randomBytes(16);

// using bit operations (unnecessary) to get individual digits
console.log([...bytes].map(v => (v >> 4).toString(16) + (v & 15).toString(16)).join(''));
// you can directly convert the byte to hexadecimal instead, making sure to pad digits.
console.log([...bytes].map(v => v.toString(16).padStart(2, '0')).join(''));
// even better, directly convert the buffer to hex
console.log(bytes.toString('hex'));