To add a catch all route for everything except for /login with Node.js Express, we add the route for /login before adding the catch all route.
For instance, we write
app.get("/login", (req, res) => {
//...
});
app.get("/", (req, res) => {
//...
});
app.get("*", (req, res) => {
//...
});
to add get routes for the /login and / URLs before adding the catch all route to let the higher route handlers handle requests to /login and /.
To avoid type errors on mocked functions with TypeScript and Jest, we use the typeof operator.
For instance, we write
import myModuleThatCallsAxios from "../myModule";
import axios from "axios";
jest.mock("axios");
const mockedAxios = axios as jest.Mocked<typeof axios>;
it("Calls the GET method as expected", async () => {
const expectedResult: string = "result";
mockedAxios.get.mockReturnValueOnce({ data: expectedResult });
const result = await myModuleThatCallsAxios.makeGetRequest();
expect(mockedAxios.get).toHaveBeenCalled();
expect(result).toBe(expectedResult);
});
to cast the type of mockedAxios and axios to jest.Mocked<typeof axios>.
jest.Mocked is the generic type for mocked objects.
typeof axios gets the type of the axios object automatically.
To select document by _id with Node.js node-mongodb-native, we call the update method.
For instance, we write
const mongo = require("mongodb");
const id = new mongo.ObjectID(theId);
collection.update({ _id: id });
to create an object ID object with the ObjectID constructor.
And then we call update to update the document in the collection with the id _id value.
To redirect user’s browser URL to a different page in Node.js, we call the Express res.redirect method.
For instance, we write
const express = require("express");
const app = express();
app.get("*", (req, res) => {
res.redirect("https://www.example.com/");
});
app.set("port", process.env.PORT || 3000);
const server = app.listen(app.get("port"), () => {});
to call res.redirect to redirect to https://www.example.com in the catch get route we created.
To get the time of day in JavaScript or Node.js, we use the date’s getHour method.
For instance, we write
const date = new Date();
const currentHour = date.getHours();
to create a date object with the current date and time with the Date constructor.
And then we call getHours on it to get the current hour of the day.