GenericErrorMiddleware.ts

import {AuthenticationError} from '../errors/authenticationError';

export default (app) => {
    app.use((error, request, response, next) => {
        if (error || response.sentry) { // using Sentry in my specific case aswell

            if (error instanceof AuthenticationError) {
                response.statusCode = 401;
                response.end(
                    JSON.stringify({
                        error: 'unauthorized',
                        eventId: undefined
                    })
                );
            } else {
                response.statusCode = 500;
                if (process.env.NODE_ENV === 'production') {
                    response.end(
                        JSON.stringify({
                            error: undefined,
                            eventId: response.sentry
                        })
                    );
                } else {
                    response.end(
                        JSON.stringify({
                            error: error.toString(),
                            eventId: undefined
                        })
                    );
                }
            }

            if (process.env.NODE_ENV !== 'production') {
                console.error(error);
            }
        }
    });
};