joseph•11mo ago

TRPC & Zod Logging

I'm building a backend and if my input validation fails I want to log the failure but couldn't figure out a way as trpc seems to handle the error straigth away, anyone know how this could be done?

2 Replies

Ahmed Elsakaan•11mo ago

I think you can do that in the errorFormatter method on the initTRPC.create function call, like so:

const t = initTRPC.context<Context>().create({
  transformer: SuperJSON,
  errorFormatter(opts) {
    const { shape, error } = opts;

    // log error
    console.log(error);

    return {
      ...shape,
      data: {
        ...shape.data,
        zodError:
          error.code === 'BAD_REQUEST' && error.cause instanceof ZodError
            ? error.cause.flatten()
            : null,
      },
    };
  },
});

const t = initTRPC.context<Context>().create({
  transformer: SuperJSON,
  errorFormatter(opts) {
    const { shape, error } = opts;

    // log error
    console.log(error);

    return {
      ...shape,
      data: {
        ...shape.data,
        zodError:
          error.code === 'BAD_REQUEST' && error.cause instanceof ZodError
            ? error.cause.flatten()
            : null,
      },
    };
  },
});

josephOP•11mo ago

Yep i saw this, but what if i want to log a specific error to my db e.g. 'validation failed on login'