Error Handling with Koa and routing-congrollers

Question

I am looking for a a solution of a generalised error handing when using the library routing-controllers.

My custom error handling should be able to catch any rejected Promises coming from the Controller, build a response body from it and sets the HTTP code according to the type of the error on the response. I do not like the Koa default error handling, as I want to spit out my custom response body (not stack trace, etc...).

On a simple setup like described in the example with passing the Controller on the initialisation of the app it is not longer possible to use a Koa error handling described in the Koa wiki.

In detail, I set up the app like:

const app = createExpressServer({
   controllers: [UserController]
});
app.listen(3000);

and try to add an error handler the following way:

app.use(async (ctx, next) => {
  try {
    await next();
  } catch (err) {
    console.log(err)
  }
});

I am not sure if I am doing something wrong or those two approaches are just not compatible. In case of the latter: Does anyone has a solution to the outlined problem?

I think you have to disable the default error handler your router provides. — thesearentthedroids, Apr 19 '18 at 10:42
@thesearentthedroids, unfortunately this is only true for express, when I do this for koa an error its thrown on the actual error and the handler does not kick in. — peterschrott, Apr 20 '18 at 11:16

Error Handling with Koa and routing-congrollers

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