Full-Stack React Projects - Second Edition

The current month preview API

We will add an API to the backend that will return the preview of expenses incurred so far in the current month. To implement this API, we will first declare a GET route, as shown in the following code.

mern-expense-tracker/server/routes/expense.routes.js:

router.route('/api/expenses/current/preview')  .get(authCtrl.requireSignin, expenseCtrl.currentMonthPreview)

A GET request to this route at '/api/expenses/current/preview' will first ensure the requesting client is a signed-in user, and then it will invoke the currentMonthPreview controller method. In this method, we will use MongoDB's aggregation framework to perform three sets of aggregations on the Expense collection and retrieve the total expenses for the ...