Hi! I’m currently trying to convert a Next.js project from using npm to pnpm. Locally on my machine everything works as expected. However, trying to deploy to Vercel, fails. Vercel is supposed to automatically detect the package manager. It correctly detects that I’m using pnpm v9 or v10 due to th…

Hey, Could you temporarily enable Source code visibility so we can check? Also just to confirm, you have set ENABLE_EXPERIMENTAL_COREPACK in your project Environment , right?

Hey! Yes, I’ve set that variable: [image] The setting for Customer Success Code Visibility doesn’t exist for me. I’ve searched all project and team settings. Maybe this doesn’t exist for my Hobby plan?

I cannot reproduce this unfortunately: [image] Do you have a minimal repository which I can try? I tried building this branch and it seems setting correct PNPM version.

I’ve built this reproduction: GitHub - simonknittel/pnpm-on-vercel-reproduction: Reproduction for https://community.vercel.com/t/corepack-not-detecting-packagemanager/8870 I’ve removed everything except for the pnpm stuff. The reproduction also runs into the same error: [image] However, I’ve not…

It looks like Vercel can find the package.json but was unable to detect a package manager defined in the file. The packageManager must be defined in your package.json in order to use corepack with Vercel, please see here .

The packageManager is set, you can see here: pnpm-on-vercel-reproduction/app/package.json at main · simonknittel/pnpm-on-vercel-reproduction · GitHub

Yes. Then, set the packageManager property in the package.json file in the root of your repository. If it’s not monorepo, you can ignore Root Directory and deploy whole app like any traditional repo

But the Root directory is needed since the app incl. it’s package.json is located in the subdirectory called app. There is no package.json in the root of the repository. [Screenshot 2025-04-28 at 13.27.56]

In that case, have you tried setting packageManager on the root directory’s package.json?

Corepack not detecting packageManager

Help

swarnava (Swarnava Sengupta) Split this topic May 8, 2025, 7:22pm 13

A post was split to a new topic: Corepack issue

Topic		Replies	Views
Vercel not picking up packageManager from package json Help	5	187	January 20, 2026
Corepack / packageManager / package.json / Root Directory misconfig Help nextjs	3	83	May 14, 2025
Vercel Deploy error due to pnpm 10.4 Help nextjs	9	1068	April 17, 2025
No Next.js version detected Help nextjs	3	1571	May 2, 2025
Ignored Build Step uses pnpm version 6.35.1 Help nextjs , react	4	83	April 16, 2026

Corepack not detecting packageManager

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