This Express.js Online Test
Separates Good From Bad Hires

A blogging application is built using an Express.js backend. The backend serves the frontend code through the public directory and also serves a few static files for the website through the static directory. The code for Express.js application is:

const express = require("express");
const path = require("path");
const app = express();

app.use(express.static(path.join(__dirname, "public")));
app.use("/images", express.static(path.join(__dirname, "static", "images")));
app.use("/files", express.static(path.join(__dirname, "static", "manuals")));

app.listen(80, () => {
  console.log("Blogging app listening on port 80");
});

Below is the folder structure of the application:

Which endpoints will return a status code of 200 for the above application?

Omega Services is updating its pricing page and they are updating their Express.js application so that the requests for the old pricing endpoint are redirected to the new endpoint. They also have an endpoint which will serve the company's brochure file.

Below is the code for the Express.js app of the company:

const express = require("express");
const path = require("path");
const app = express();

app.get("/omega/pricing", (req, res) => {
  ____________("/omega/pricingnew");
});

app.get("/omega/brochure", (req, res) => {
  ____________(path.join(̲ ̲ dirname, "public", "brochure.pdf"));
});

app.get("/omega/pricingnew", (req, res) => {
  res.send("Omega has the best deals");
});

app.listen(80, () => {
  console.log("Omega app listening on port 80");
});

Fill in the blanks so that all endpoints of the application respond as expected.

A temperature converter service is built using an Express.js backend. The service is used to convert units from Fahrenheit to Celsius. The endpoint receives the request with the content type as application/json, and is authenticated by verifying the value of "X-Auth-Key" in the headers.

The code for the Express.js application is:

const express = require("express");
const app = express();

const authCheck = (req, res, next) => {
  const authKey = _______("X-Auth-Key");
  if (authKey == "secret") {
    next();
  } else {
    res.status(401).end();
  }
};

app.use(____________());

app.post("/tocelsius", authCheck, (req, res) => {
  const fahrenheit = req.body.fahrenheit;
  res.json({ celsius: ((fahrenheit - 32) * 5) / 9 });
});

app.listen(80, () => {
  console.log("Temperature converter app listening on port 80");
});

The following JSON is passed to the request body

{
  "fahrenheit" : 95
}

Considering the JSON above, fill in the blanks so that the service functions successfully.