The `punycode` module is deprecated. Please use a userland alternative instead.

[fse]

We implemented several SAP UI5 applications using VS Code and SAP Fiori Tools.

About 4 weeks ago everything was fine.

But now when we try to Preview one ofthose applications we face the following warning :

(node:34256) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
Command run failed with error spawn EINVAL

what stops the fiori run prozess from working.

Any ideas how to ignore that warning?

or solve the deprication?

TIA Frank

[b_willaert]

Same issue here .

[gregorw]

Hi Frank,

have you filed a Case via SAP Support? The Case I've created is 903584/2025.

My current analysis:

This issue occurs when I create a Adaptation Project or Extension Project in SAP Business Application Studio.  My BAS is currently on Node.JS v22.13.1 there I got this error:

npm run start

> app.lineitems.variant@0.1.0 start
> fiori run --open /test/flp.html#app-preview

(node:16471) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)

when I run using the --trace-deprecation parameter I see this output:

node --trace-deprecation node_modules/@sap/ux-ui5-tooling/dist/cli/index.js run --open /test/flp.html#app-preview
(node:15097) [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:110:7)
    at Function._load (node:internal/modules/cjs/loader:1095:17)
    at TracingChannel.traceSync (node:diagnostics_channel:322:14)
    at wrapModuleLoad (node:internal/modules/cjs/loader:217:24)
    at Module.<anonymous> (node:internal/modules/cjs/loader:1335:12)
    at require (node:internal/modules/helpers:136:16)
    at ../../node_modules/node-fetch/node_modules/whatwg-url/lib/url-state-machine.js (/home/user/projects/app.lineitems.variant/node_modules/@sap/ux-ui5-tooling/dist/cli/index.js:19310:20)
Command run failed with error : 

trying to replicate the same localy I get:

npm run start  

> applogs.app.variant@0.1.0 start
> fiori run --open /test/flp.html#app-preview

(node:60825) [DEP0040] DeprecationWarning: The `punycode` module is deprecated. Please use a userland alternative instead.
(Use `node --trace-deprecation ...` to show where the warning was created)
info fiori-tools-appreload Livereload middleware started for port 35729 and path

so you see local with the same Node.JS Version the app is starting. So must be some special setting in BAS.

Best regards,
Gregor

[RiabovAleksandr]

SAP Support replied:

Hi,

A change has been introduced to resolve this issue, our release schedule is every two weeks, so please expect the version to be available end of week, Sept 8th;

https://www.npmjs.com/package/@sap/ux-ui5-tooling?activeTab=versions

[M-K]

For me only this error was shown:

Command run failed with error : spawn EINVAL

I solved it by using "npm update" in the console, afterwards the preview worked for me.

[flachlaender]

ANy solution for this yet? I have the same problem.