Where to handle errors in nodejs?

Question

JavaScript

I read Handle errors centrally. Not within middlewares

There is an encapsulated, central error handler:

module.exports.handler = new errorHandler();

function errorHandler() {
  this.handleError = async (err) => {
    await logger.logError(err);
    await sendMailToAdminIfCritical;
    await saveInOpsQueueIfCritical;
    await determineIfOperationalError;
  };
}

Further, if I want to use it in express \ koa, then I connect the error-handling middleware to the end, according to this scheme:

Some module throws an error -> API router catches the error -> it propagates the error to the middleware (eg Express, KOA) who is responsible for catching errors -> a centralized error handler is called -> the middleware is being told whether this error is an untrusted error (not operational) so it can restart the app gracefully.

// в конец после всех middleware
app.use((error, req, res, next) => {
    errorHandler.handleError(error)
}

However, it is written that

Note that it's a common, yet wrong, practice to handle errors within Express middleware – doing so will not cover errors that are thrown in non-web interfaces.

Question - where in this case to put the error handler, if not in the middleware?

Answer 1

https://medium.com/devcbeirut/error-handling-js-ex...