TRPCClientError: JSON Parse error: Single quotes (') are not allowed in JSON

I am getting this error when deployed but not when running locally.

TRPCClientError: JSON Parse error: Single quotes (') are not allowed in JSON

TRPCClientError: JSON Parse error: Single quotes (') are not allowed in JSON

TRPCClientError: JSON Parse error: Single quotes (') are not allowed in JSON

TRPCClientError: JSON Parse error: Single quotes (') are not allowed in JSON

Any idea on how to narrow this down?