Prisma•8mo ago

Prisma 6.6.0: Unable to use Prisma.JsonNull and Prisma.DbNull due to "We could not serialize [object

I have hit a problem that is affecting both dev and prod... on a Friday night.
Any help on the GH issue would be helpful: https://github.com/prisma/prisma/issues/26987

GitHub

Prisma 6.6.0: Unable to use Prisma.JsonNull and Prisma.DbNull due t...

Bug description After updating to Prisma 6.6.0 i have been facing this issue. Severity

Major: Breaks core functionality (e.g., migrations fail) Reproduction Create schema with optional Json fiel...

Prisma AI Help•4/25/25, 7:18 PM

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PPrisma AI Help You chose to compile with the bot. One moment while I piece together your answer...

Prisma AI HelpAPP•4/25/25, 8:56 PM

I can see you're having issues with Prisma 6.6.0 related to and . Based on the knowledge sources, this appears to be a known issue in Prisma 6.6.0 with the new generator.

The issue is related to type checking failures with the client generated by the new generator. Specifically, there are errors with the , , and properties in the generated client:

This is happening because the generated client contains code that violates TypeScript constraints, particularly when using in your tsconfig.json.

A temporary workaround that has been suggested is to create a script that modifies the generated client after Prisma generates it:

Then add this to your package.json:

This issue has been reported in GitHub issue #26841 and GitHub issue #26902.

Another simpler but less ideal workaround is to add at the top of the file, though this would need to be done after each file generation.

I hope this helps with your Friday night emergency!

GitHub: prisma/prisma

PPrisma AI Help I can see you're having issues with Prisma 6.6.0 related to `Prisma.JsonNull` an...

Prisma AI HelpAPP•4/25/25, 8:57 PM

Alright, thanks for letting us know that there's still some help needed. A team member will reply to you shortly.

In the meantime, please let us know any additional info, questions, or which parts of the answer may need clarification.

Nurul•4/27/25, 11:07 AM

Hey!

Does this error occur on Prisma version 6.5.0 as well?

antonioOP•4/28/25, 8:20 AM

No, it startted to happen once I have updated from 6.5 to 6.6

antonioOP•4/28/25, 8:20 AM

So it seems to be 6.6 issue

antonioOP•4/28/25, 8:21 AM

@Nurul (Prisma) instead of JsonNull/DbNull can i just use

null

null

for the time while you fix this in the next relese?

antonioOP•4/29/25, 3:37 PM

@Nurul any update?

Nurul•4/30/25, 2:25 PM

Hey @antonio We released a new version 6.7.0 yesteday. Can you check if the issue gets resolved when you update to version 6.7.0?