example for node blog article error handling - heroku - the route with the most H12 timeouts

gistfile1.js

	routeConfig.post('/Dashboard/Index', repos.DashboardRepository.getRangeData(repos), (req, res) => {
		let queries = [], 
			sess = req.userSession,
			filter = req.rangeFilter;

		queries.push(repos.PromotionRepository.getAgencyPromotions(sess.agencyId, 'all'));
		queries.push(repos.DashboardRepository.getIndex(repos, filter, sess));
		queries.push(repos.PolicyRepository.getPolicies(filter, true));

		Promise.all(queries)
		.then(([promotions, [totalRanks, myNumbers, totalProduction], policies]) => {
			let sources = helpers.PolicyHelper.parseSourcesFromPolicies(policies);

			totalProductionByMonth = helpers.DashboardHelper.validateTotalProduction(totalProduction);
			myNumbers = helpers.DashboardHelper.buildMyNumbers(myNumbers);

			res.json({
				view: {
					agencies: sess.agencyId !== 0,
					promotions: sess.agencyId !== 0,
					isReport: filter.reportId !== 0,
					latestReportMonth: filter.lastestPayrollName ? filter.lastestPayrollName : '',
					noPreviousPayrolls: !filter.latestPayroll
				},

				promotions: helpers.PromotionHelper.dashboard(promotions),
				totalProduction: totalProductionByMonth,
				totalRanks: totalRanks.filter(tr => tr.amount > 0),
				sources: sources,
				myNumbers: myNumbers
			});
		});
	});

gistfile2.js

	routeConfig.all('/*', (req, res, next) => {
		req.userSession = req.session.user;

		if (req.userSession || util.publicUrls(req.originalUrl)) 
			next();
		else
			req.xhr ? res.sendStatus(401) : res.redirect('/User/Login');
	});

gistfile3.js

	getRangeData(repos) {
		return (req, res, next) => {
			let filterQueries = [],
				sess = req.userSession,
				agentId = sess.agentId,
				values = req.body.values,
				filter = values ? values.filter : { reportId: 0, statuses: ['issued'] },
				isUpcoming = filter.reportId === 'n',
				agencyId = common.getAgencyIdForFiltering(filter, sess);

				/* 	special case when only parts of page want pending data */
			if (values.pendingConditional) 
				filter.statuses.push('pending');

			/*	Filter agencyIds prior to queries to avoid agency filter per query */
			filterQueries.push(repos.UserRepository.byAgencyId(agencyId, true));
			filterQueries.push(repos.ReportRepository.getLastPayroll(agentId));

			Promise.all(filterQueries)
			.then(([agency, latestPayroll]) => { 
				/* 	add range to filters */
				let userArrays = agency.map(a => a.Users),
					users = [].concat(...userArrays);

				filter.userIds = users.map(u => u.userId);
				filter.latestPayrollId = latestPayroll ? latestPayroll.reportId : 0;
				filter.latestPayroll = common.parseAndBuildDates(latestPayroll, sess, isUpcoming);
				filter.reportId = isUpcoming ? 0 : filter.reportId;
				filter.lastestPayrollName = latestPayroll ? latestPayroll.name : null;
				filter.payrollRun = filter.reportId > 0 && !isUpcoming;
				filter.currentUserId = filter.userId || sess.userId;
				filter.isUpcoming = isUpcoming;

				/* add to request as it will repeat for many */
				req.rangeFilter = filter; 

				next() 
			});
		}
	}