NEXT_SERVER_ACTIONS_ENCRYPTION_KEY Generator

generator.mjs

// you can run this on latest chrome browser and copy the result

function arrayBufferToString(buffer) {
  const bytes = new Uint8Array(buffer)
  const len = bytes.byteLength

  // @anonrig: V8 has a limit of 65535 arguments in a function.
  // For len < 65535, this is faster.
  // https://github.com/vercel/next.js/pull/56377#pullrequestreview-1656181623
  if (len < 65535) {
    return String.fromCharCode.apply(null, bytes)
  }

  let binary = ''
  for (let i = 0; i < len; i++) {
    binary += String.fromCharCode(bytes[i])
  }
  return binary
}

const key = await crypto.subtle.generateKey(
  {
    name: 'AES-GCM',
    length: 256,
  },
  true,
  ['encrypt', 'decrypt']
)
const exported = await crypto.subtle.exportKey('raw', key)
const b64 = btoa(arrayBufferToString(exported))
console.log(b64)