DeprecationWarning: The 'punycode' module is deprecated in Node.js

[Hellnight2005]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the bug has not already been reported

Mongoose version

8.13.2

Node.js version

22.13.1

MongoDB server version

6.15.0

Typescript version (if applicable)

No response

Description

When using Mongoose, Node.js throws a deprecation warning related to the internal use of the punycode module.

Warning Message
(node:21076) [DEP0040] DeprecationWarning: The punycode module is deprecated. Please use a userland alternative instead.

Steps to Reproduce

1. Create a simple Node.js app that uses Mongoose.
2. Run the app using a modern Node.js version (v22.13.1).
3. Observe the warning in the terminal.

This happens because Node.js has officially deprecated the punycode module as mentioned in their documentation:

🔗Node Docs
But it seems that Mongoose (or one of its dependencies) is still using punycode through Node's core modules, which causes this warning.

Steps to Reproduce

link to the project

Expected Behavior

No response

[vkarpov15]

I'm unable to repro, running the following script:

'use strict';

const mongoose = require('mongoose');

mongoose.connect('mongodb://127.0.0.1:27017/mongoose_test').then(() => {
  console.log('Connected', mongoose.version, process.version);
});

Gives me the following output:

$ node ./gh-15358.js
Connected 8.13.2 v22.12.0

Try using node --trace-deprecation?

[KeniaNya]

I have the same warning when using the library

$ node --trace-deprecation index.js
(node:9872) [DEP0040] DeprecationWarning: The punycode module is deprecated. Please use a userland alternative instead.
at node:punycode:3:9
at BuiltinModule.compileForInternalLoader (node:internal/bootstrap/realm:399:7)
at BuiltinModule.compileForPublicLoader (node:internal/bootstrap/realm:338:10)
at loadBuiltinModule (node:internal/modules/helpers:112:7)
at Function._load (node:internal/modules/cjs/loader:1100:17)
at TracingChannel.traceSync (node:diagnostics_channel:322:14)
at wrapModuleLoad (node:internal/modules/cjs/loader:219:24)
at Module.require (node:internal/modules/cjs/loader:1340:12)
at require (node:internal/modules/helpers:138:16)
at Object. (C:\myProjects\myMongoDBApplication\node_modules\node-fetch\node_modules\whatwg-url\lib\url-state-machine.js:2:18)

Using mongoose 8.14.1
Node version 22.12.0

[Hellnight2005]

Would have any idea how to solve it or other way around

…

On Thu, May 1, 2025, 3:04 PM Kenia Nya! ***@***.***> wrote: *KeniaNya* left a comment (Automattic/mongoose#15358) <#15358 (comment)> I have the same warning when using the library $ node --trace-deprecation index.js (node:9872) [DEP0040] DeprecationWarning: The punycode module is deprecated. Please use a userland alternative instead. at node:punycode:3:9 at BuiltinModule.compileForInternalLoader (node:internal/bootstrap/realm:399:7) at BuiltinModule.compileForPublicLoader (node:internal/bootstrap/realm:338:10) at loadBuiltinModule (node:internal/modules/helpers:112:7) at Function._load (node:internal/modules/cjs/loader:1100:17) at TracingChannel.traceSync (node:diagnostics_channel:322:14) at wrapModuleLoad (node:internal/modules/cjs/loader:219:24) at Module.require (node:internal/modules/cjs/loader:1340:12) at require (node:internal/modules/helpers:138:16) at Object. (C:\myProjects\myMongoDBApplication\node_modules\node-fetch\node_modules\whatwg-url\lib\url-state-machine.js:2:18) Using mongoose 8.14.1 Node version 22.12.0 — Reply to this email directly, view it on GitHub <#15358 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BDWDPIXFVIWEUWR5YHBM7KL24HTC5AVCNFSM6AAAAAB3HZCAUSVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDQNBUGUZDOMBYHE> . You are receiving this because you modified the open/close state.Message ID: ***@***.***>