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onServerValidate doesn't work with Zod in NextJs #1609
Description
Describe the bug
onServerValidate doesn't seem to work properly with Zod schemas.
Instead of populating the form with error messages, the form is receiving entire objects. Here's a link that reproduces the issue: https://stackblitz.com/edit/tanstack-form-3wvkfapn?file=src%2Fapp%2Faction.ts
Your minimal, reproducible example
https://stackblitz.com/edit/tanstack-form-3wvkfapn?file=src%2Fapp%2Faction.ts
Steps to reproduce
Go to link to reproduce the issue. Try to enter a number like '9'.
Expected behavior
Form should be populated with error messages, not zod error objects.
How often does this bug happen?
None
Screenshots or Videos
No response
Platform
Windows 11
TanStack Form adapter
None
TanStack Form version
1.14.1
TypeScript version
No response
Additional context
No response
Reacted by tomdev10
Activity
heinsenberg82 commentedon Jul 9, 2025
Based on this (https://github.com/TanStack/form/releases/tag/v0.43.0), I made another fork following (I think) the instructions there, but still not working: https://stackblitz.com/edit/tanstack-form-q5ym4nkq?file=src%2Fapp%2Fclient-component.tsx
crutchcorn commentedon Jan 30, 2026
Can you retest with:
I believe we have a fix for many (if not all) Form SSR behaviors
crutchcorn commentedon Feb 13, 2026
Should be fixed in 1.28.1