Using openpgpjs from a Netlify Function

I would like to encrypt data from a Netlify Function before saving it.
When I import openpgpjs, Netlify throws an error about a missing “stream” module. I thought stream was included by default in Node and accessible from a Function.

The error appearing in a browser when GETting the page is as follow :

{"errorType":"Runtime.ImportModuleError","errorMessage":"Error: Cannot find module 'stream'","trace":["Runtime.ImportModuleError: Error: Cannot find module 'stream'","    at _loadUserApp (/var/runtime/UserFunction.js:100:13)","    at Object.module.exports.load (/var/runtime/UserFunction.js:140:17)","    at Object.<anonymous> (/var/runtime/index.js:45:30)","    at Module._compile (internal/modules/cjs/loader.js:778:30)","    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)","    at Module.load (internal/modules/cjs/loader.js:653:32)","    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)","    at Function.Module._load (internal/modules/cjs/loader.js:585:3)","    at Function.Module.runMain (internal/modules/cjs/loader.js:831:12)","    at startup (internal/bootstrap/node.js:283:19)"]}

Here is the full code for a function encrypting and then decrypting data for test.

const openpgp = require('openpgp');

exports.handler = async function() {
  const { privateKeyArmored, publicKeyArmored } = await openpgp.generateKey({
    userIds: [{ fileName: "" }],
    passphrase: '',
    numBits: 2048,
    curve: 'p256'

  const message = "Lorem ipsum."
  const ciphertext = await openpgp.encrypt({
    message: await openpgp.message.fromText(message),
    publicKeys: (await openpgp.key.readArmored(publicKeyArmored)).keys
  }).catch(e => console.error(e.message)).then(m => m &&

  if (!ciphertext)
    throw new Error("Internal error.")

  const privateKeyObj = (await openpgp.key.readArmored(privateKeyArmored)).keys[0]
  if (!privateKeyObj.isDecrypted())
    await privateKeyObj.decrypt("")
  const cleartext = await openpgp.decrypt({
    message: await openpgp.message.readArmored(ciphertext),
    privateKeys: [privateKeyObj],
  }).catch(e => console.error(e.message)).then(m =>

  if (!cleartext)
    throw new Error("Internal error.")

  return {
    statusCode: 200,
    body: cleartext

Am I missing something ?
Thank you for your help.

Hi @alxmhe, it seems like the issue isn’t specific to lambda functions. Can you try the workaround mentioned here? Specifically using nodeRequire('openpgp') instead of the regular require('openpgp'). Let me know if that helps.