Turbopack Error: Failed to write app endpoint /page

[respectedbro]

Turbopack version: 92bbbb1b
Next.js version: 0.0.0

Error message:

Turbopack Error: Failed to write app endpoint /page

[yassine-krichen]

I guess that error message is basically Turbopack saying “I tried to write a file and immediately regretted it.”

Anyway, the usual culprits are pretty boring:

1. File system permissions being silly
If Turbopack can’t write the compiled output for /page, it might literally not be allowed to.
Common causes:

• Your project folder has weird read-only flags.
• You're running inside WSL and the filesystem is doing its emo phase.
• A process is locking the .next or .turbopack build files.

2. The path conflicts with something already there
If you have:

app/page
app/page.ts
app/page.js
app/page/ (a folder)

or anything else that would confuse the bundle writer, Turbopack sometimes just gives up.

3. Corrupted build cache
Turbopack’s cache breaks faster than my patience.
Try wiping:

rm -rf .next
rm -rf node_modules/.cache

Then restart your dev server.

4. An accidental “0.0.0” Next.js version
The guy used "next": "0.0.0".
That’s not a version. That’s a cry for help.
Your build tooling will absolutely freak out if the actual installed version doesn’t match the lockfile or if something corrupted node_modules.

Fix: delete node_modules and reinstall:

rm -rf node_modules package-lock.json
npm install

5. Experimental Turbopack builds
He’s using a commit hash Turbopack version. That’s basically running your project on a prototype engine someone welded together at 3 a.m. Wouldn’t be shocked if it’s just broken upstream.

Fix: update Next.js and Turbopack to real releases:

npm install next@latest

Hope this helps.

[subhobhai943]

Great troubleshooting tips from @yassine-krichen! I'd like to add a few more things to check:

6. Check Disk Space
The error "Failed to write" could also indicate insufficient disk space. Make sure you have enough free space on your drive:

df -h  # On Linux/macOS

7. Antivirus/Security Software
Some antivirus or security software can block file writes in development directories. Try temporarily disabling it or adding your project folder to the exclusion list.

8. Run with elevated permissions
If you're on Windows and running into permission issues, try running your terminal as administrator. On Linux/macOS:

sudo npm run dev

(Though this isn't recommended for regular development)

9. Check the complete error stack
Can you share the complete error stack trace? There might be more details after the "Failed to write app endpoint /page" message that could help pinpoint the exact issue.

Also, as mentioned, the Next.js version: 0.0.0 is definitely suspicious. This typically means your package.json or node_modules are corrupted. A fresh install should fix this.