Express.js Quiz ( Beginner ) - All Questions

This beginner-level Express.js quiz is designed for developers who are starting with backend development using Node.js. It covers core Express concepts like routing, middleware, request-response handling, and basic server setup in a simple, interview-friendly way.

Question 1: What is Express.js?

A database
A Node.js web framework
A frontend library
A programming language

Explanation: Express.js is a web framework built on top of Node.js.

Question 2: Express.js is mainly used for?

Building mobile apps
Creating APIs and web servers
Styling web pages
Managing databases

Explanation: Express.js helps build APIs and server-side applications.

Question 3: Which command installs Express.js?

npm add express
npm install express
node install express
express install

Explanation: npm install express installs the Express framework.

Question 4: Which function creates an Express application?

express()
createApp()
new Express()
app()

Explanation: Calling express() creates an Express app instance.

Question 5: Which object represents the incoming request?

res
req
request
http

Explanation: req represents the HTTP request.

Question 6: Which object is used to send a response?

req
response
res
send

Explanation: res is used to send data back to the client.

Question 7: Which HTTP method is used to fetch data?

POST
PUT
GET
DELETE

Explanation: GET is used to retrieve data from the server.

Question 8: Which HTTP method is used to create data?

GET
POST
PATCH
HEAD

Explanation: POST is used to create new resources.

Question 9: What does app.listen() do?

Handles routing
Starts the server
Parses requests
Stops the server

Explanation: app.listen() starts the Express server.

Question 10: Which port is commonly used for Express apps?

80
3000
21
8080

Explanation: Port 3000 is commonly used during development.

Question 11: What is middleware in Express?

A database layer
A function that handles requests and responses
A frontend component
A routing method

Explanation: Middleware functions run between request and response.

Question 12: Which middleware parses JSON request bodies?

express.urlencoded()
express.json()
bodyParser()
jsonParser()

Explanation: express.json() parses JSON payloads.

Question 13: Which middleware parses URL-encoded data?

express.urlencoded()
express.json()
urlParser()
bodyParser.json()

Explanation: express.urlencoded() parses form data.

Question 14: Which method defines a GET route?

app.fetch()
app.route()
app.get()
app.read()

Explanation: app.get() defines a GET route.

Question 15: Which method defines a POST route?

app.create()
app.send()
app.post()
app.write()

Explanation: app.post() handles POST requests.

Question 16: What does res.send() do?

Ends the request
Sends response data
Redirects request
Parses JSON

Explanation: res.send() sends data to the client.

Question 17: What does res.json() do?

Sends plain text
Sends HTML
Sends JSON response
Parses JSON

Explanation: res.json() sends a JSON response.

Question 18: Which method sets the HTTP status code?

res.code()
res.status()
res.sendStatus()
res.header()

Explanation: res.status() sets the response status code.

Question 19: What does app.use() do?

Defines routes only
Registers middleware
Starts server
Stops middleware

Explanation: app.use() registers middleware functions.

Question 20: Which middleware logs HTTP requests?

helmet
cors
morgan
dotenv

Explanation: Morgan is used for logging HTTP requests.

Question 21: Which package helps handle environment variables?

config
dotenv
env
process

Explanation: dotenv loads environment variables from a file.

Question 22: Which file usually contains Express server setup?

package.json
server.js or app.js
index.html
config.env

Explanation: Server configuration is usually in app.js or server.js.

Question 23: Which HTTP status code means success?

Explanation: 200 indicates a successful request.

Question 24: Which status code means resource not found?

Explanation: 404 means the resource was not found.

Question 25: How do you send a redirect response?

res.move()
res.redirect()
res.route()
res.forward()

Explanation: res.redirect() sends a redirect response.

Question 26: What does next() do in middleware?

Stops request
Ends response
Passes control to next middleware
Restarts server

Explanation: next() passes control to the next middleware.

Question 27: Which Express feature helps organize routes?

Controllers
Routers
Models
Views

Explanation: Express Router helps organize routes.

Question 28: Which method creates a router?

express.route()
express.router()
express.Router()
app.router()

Explanation: express.Router() creates modular routes.

Question 29: Which middleware handles CORS?

helmet
cors
morgan
body-parser

Explanation: cors enables Cross-Origin Resource Sharing.

Question 30: Which command starts an Express app?

node app.js
npm express
express start
npm install

Explanation: node app.js runs the Express server.

Question 31: Which object contains route parameters?

req.body
req.query
req.params
req.headers

Explanation: req.params contains route parameters.

Question 32: Which object contains query string values?

req.body
req.query
req.params
req.cookies

Explanation: req.query holds query string data.

Question 33: Which object contains POST request data?

req.query
req.params
req.body
req.headers

Explanation: req.body contains POST data.

Question 34: Which middleware helps secure HTTP headers?

cors
helmet
morgan
dotenv

Explanation: helmet helps secure HTTP headers.

Question 35: Which Express feature supports template engines?

Views
Models
Controllers
Middlewares

Explanation: Views allow template engine integration.

Question 36: Which template engine is commonly used with Express?

Handlebars
EJS
Pug
All of the above

Explanation: Express supports multiple template engines.

Question 37: What does express.static() do?

Creates routes
Serves static files
Handles APIs
Parses JSON

Explanation: express.static() serves static assets.

Question 38: Which folder commonly stores static files?

views
routes
public
models

Explanation: Static assets are stored in the public folder.

Question 39: Which HTTP status code indicates server error?

Explanation: 500 indicates a server error.

Question 40: What does REST stand for?

Remote Execution State Transfer
Representational State Transfer
Response State Transfer
Request Execution Syntax Tree

Explanation: REST stands for Representational State Transfer.

Question 41: Which Express method handles all HTTP methods?

app.all()
app.any()
app.use()
app.route()

Explanation: app.all() handles all HTTP methods.

Question 42: Which status code indicates unauthorized access?

Explanation: 401 indicates unauthorized access.

Question 43: Which status code indicates forbidden access?

Explanation: 403 means access is forbidden.

Question 44: Which method is used to chain route handlers?

app.chain()
app.route()
app.link()
app.use()

Explanation: app.route() allows chaining handlers.

Question 45: Which Express feature improves code readability?

Inline routing
Router modules
Global variables
Synchronous code

Explanation: Router modules organize code cleanly.

Question 46: What is Express.js built on top of?

React
Node.js
MongoDB
HTTP/2

Explanation: Express.js is built on Node.js.

Question 47: What is the main benefit of Express.js?

Frontend rendering
Minimal and flexible backend framework
Database management
Mobile UI creation

Explanation: Express is minimal and flexible for backend development.

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Express.js Quiz ( Beginner )

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Express.js Quiz ( Beginner )