Trình tạo CUID2

import { createId } from '@paralleldrive/cuid2'

// Generate a single CUID2 (default length: 24)
const id = createId()
console.log(id) // e.g. "tz4a98xxat96iws9zmbrgj3a"

// Custom length
import { init } from '@paralleldrive/cuid2'
const createShortId = init({ length: 16 })
const shortId = createShortId()
console.log(shortId) // e.g. "tz4a98xxat96iws9"

model User {
  id        String   @id @default(cuid())
  email     String   @unique
  name      String?
  createdAt DateTime @default(now())
  updatedAt DateTime @updatedAt
}

async function generateCuid2(length = 24) {
  const alphabet = 'abcdefghijklmnopqrstuvwxyz'

  // Random prefix letter
  const firstByte = crypto.getRandomValues(new Uint8Array(1))[0]
  const firstChar = alphabet[firstByte % 26]

  // Random 32-byte salt
  const salt = crypto.getRandomValues(new Uint8Array(32))
  const saltHex = [...salt].map(b => b.toString(16).padStart(2, '0')).join('')

  // SHA-512 of timestamp + salt
  const input = Date.now().toString(36) + saltHex
  const hashBuffer = await crypto.subtle.digest(
    'SHA-512',
    new TextEncoder().encode(input)
  )

  // Encode hash bytes as base-36 string
  const bytes = new Uint8Array(hashBuffer)
  let hash = ''
  for (let i = 0; i < bytes.length; i += 8) {
    let chunk = 0n
    for (let j = 0; j < 8 && i + j < bytes.length; j++) {
      chunk = (chunk << 8n) | BigInt(bytes[i + j])
    }
    hash += chunk.toString(36)
  }

  return (firstChar + hash).slice(0, length)
}

// Usage
const id = await generateCuid2()
console.log(id) // e.g. "m7k3r9p2nxq8zt5a6cwj4bvd"