How to let express middleware handle errors?

[jakub-msqt]

I'm using express-zod-api as middleware to my existing express app. If I throw error in the endpoint, it ends up in ResultHandler as expected. If I re-throw the error from there, it never reaches error middleware registered after attachRouting which is expected too. I've used the snippet below to end up there with express routes before.

export const routeHandler =
  (fn: RequestHandler) => (req: Request, res: Response, next: NextFunction) =>
    Promise.resolve(fn(req, res, next)).catch(next)

Is there a way to achieve the same with this library?

[RobinTail]

Hello, @jakub-msqt .

The error handling workflow is described here:
https://ez.robintail.cz/v25.5.2/error-handling

Express Zod API is not a middleware, because it does not call next() here:

express-zod-api/express-zod-api/src/routing.ts

Lines 94 to 96 in 49e871e

	.concat(async (request, response) => {
	const logger = getLogger(request);
	return endpoint.execute({ request, response, logger, config });

It is designed to handle errors by the ResultHandler attached to EndpointsFactory, so that negative responses would be consistent and match their depiction in the generated documentation.

When you throw from ResultHandler it ends up in lastResortHandler.

So, why won't you place your error handling in a ResultHandler? Or into a shared function that you'd call there?