This Express.js Online Test
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About the test

The Express.js online test evaluates candidates’ knowledge of key concepts for building applications with Express.js.

It is an ideal test for pre-employment screening. A good Express.js developer should be able to work with the library to build robust and scalable web services.

The online test requires candidates to answer multiple choice and fill-in-the-blank questions about Express.js.

Sample public questions

3 min
Express.js Middleware
HTTP Routing

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:

Folder structure of application.

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

3 min
HTTP Routing

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) => {

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.

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Skills and topics tested

  • Express.js
  • HTTP Routing
  • Express.js Middleware
  • Forms
  • Error Handling
  • HTTP

For job roles

  • Express.js Developer

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