pes04 Posts

pes04

•Created by pes04 on 5/8/2025 in #❓-help

Question about onError and modifying error messages in tRPC

I’m trying to follow the tRPC docs on error handling and want to log detailed errors on the server by throwing specific exceptions but send a generic message to the client (see https://trpc.io/docs/server/error-handling#handling-errors). I thought this would work:

onError: (opts) => {
  logError(`Error in TRPC in path=${opts.path}`, opts.error);

  opts.error = new TRPCError({
    code: 'INTERNAL_SERVER_ERROR',
    message: 'An error happened. Please try again',
  });
}

onError: (opts) => {
  logError(`Error in TRPC in path=${opts.path}`, opts.error);

  opts.error = new TRPCError({
    code: 'INTERNAL_SERVER_ERROR',
    message: 'An error happened. Please try again',
  });
}

But it doesn’t seem to have any effect — the original error is still sent to the client. According to the docs, I assumed mutating opts.error would override the one sent to the client. Am I misunderstanding something, or is there another way to do this? Thanks in advance.

6 replies