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express MCQ Mock Test

60 Questions • 20 Seconds / Question

⏱ 00:20

Q 1/60

express MCQs with Answers

1. Which package prevents CSRF?

A. csrf
B. csurf
C. secure-csrf
D. protect

Correct: B

Explanation: csurf protects against CSRF.

2. Which template engine is commonly used?

A. EJS
B. JSP
C. Thymeleaf
D. Blade

Correct: A

Explanation: EJS is commonly used.

3. CSRF stands for?

A. Cross Site Request Forgery
B. Cross Server Request Form
C. Client Side Request Fetch
D. Cross Script Request

Correct: A

Explanation: CSRF is a security vulnerability.

4. Which method sends JSON response?

A. res.send()
B. res.text()
C. res.json()
D. res.write()

Correct: C

Explanation: res.json() sends JSON.

5. Which HTTP method is idempotent?

A. POST
B. PUT
C. PATCH
D. CONNECT

Correct: B

Explanation: PUT is idempotent.

6. How to access query parameters?

A. req.params
B. req.query
C. req.body
D. req.headers

Correct: B

Explanation: req.query accesses query params.

7. Which middleware enables CORS?

A. helmet
B. cors
C. security
D. allow

Correct: B

Explanation: cors enables cross-origin requests.

8. How many arguments error middleware has?

A. 2
B. 3
C. 4
D. 5

Correct: C

Explanation: Error middleware has 4 arguments.

9. How to handle async errors?

A. try/catch
B. next(err)
C. Both A and B
D. Ignore

Correct: C

Explanation: Use try/catch and next.

10. What is Express.js?

A. A frontend framework
B. A Node.js web framework
C. A database
D. A programming language

Correct: B

Explanation: Express.js is a minimal web framework for Node.js.

11. PATCH is used for?

A. Create
B. Delete
C. Partial update
D. Full replace

Correct: C

Explanation: PATCH partially updates resource.

12. Winston is used for?

A. Routing
B. Logging
C. Security
D. Testing

Correct: B

Explanation: Winston is logging library.

13. Unhandled promise rejection causes?

A. Crash
B. Warning
C. Memory leak
D. Nothing

Correct: A

Explanation: Unhandled rejections may crash app.

14. Which package enables compression?

A. zip
B. compress
C. compression
D. gzip

Correct: C

Explanation: compression enables gzip.

15. Which package loads env variables?

A. dotenv
B. env
C. config
D. process-env

Correct: A

Explanation: dotenv loads env vars.

16. Which function serves static files?

A. express.static()
B. app.static()
C. res.static()
D. serve.static()

Correct: A

Explanation: express.static serves static files.

17. Session data is stored in?

A. Client only
B. Server
C. Database
D. All of the above

Correct: D

Explanation: Sessions can be stored in many ways.

18. Which method renders a template?

A. res.send()
B. res.render()
C. res.view()
D. res.template()

Correct: B

Explanation: res.render renders templates.

19. Which object represents the request?

A. res
B. req
C. request
D. response

Correct: B

Explanation: req represents incoming request.

20. Which method handles POST requests?

A. app.get()
B. app.post()
C. app.fetch()
D. app.send()

Correct: B

Explanation: app.post() handles POST requests.

21. Which function passes control to next middleware?

A. next()
B. continue()
C. pass()
D. skip()

Correct: A

Explanation: next() passes control.

22. REST API usually returns?

A. HTML
B. XML
C. JSON
D. TXT

Correct: C

Explanation: JSON is standard.

23. Which middleware secures HTTP headers?

A. cors
B. helmet
C. secure
D. auth

Correct: B

Explanation: helmet secures HTTP headers.

24. Where should error middleware be placed?

A. Top
B. Middle
C. End
D. Anywhere

Correct: C

Explanation: Error middleware goes at end.

25. Which design principle REST follows?

A. Stateless
B. Stateful
C. Session-based
D. None

Correct: A

Explanation: REST APIs are stateless.

26. Which object holds headers?

A. req.headers
B. req.header
C. req.head
D. req.config

Correct: A

Explanation: req.headers holds headers.

27. Which method sets status code?

A. res.code()
B. res.status()
C. res.setCode()
D. res.header()

Correct: B

Explanation: res.status sets status code.

28. Express.js is built on top of which platform?

A. React
B. Angular
C. Node.js
D. Django

Correct: C

Explanation: Express.js runs on Node.js.

29. Which middleware parses URL encoded data?

A. express.urlencoded()
B. express.form()
C. body.urlencoded()
D. form.parse()

Correct: A

Explanation: express.urlencoded parses form data.

30. Which middleware logs requests?

A. logger
B. morgan
C. log4js
D. winston

Correct: B

Explanation: morgan logs HTTP requests.

31. Which header defines content type?

A. Accept
B. Content-Type
C. Authorization
D. Host

Correct: B

Explanation: Content-Type defines data type.

32. XSS stands for?

A. Cross Site Scripting
B. Cross Server Script
C. XML Style Script
D. Cross System Security

Correct: A

Explanation: XSS is security vulnerability.

33. Which function creates router?

A. express.router()
B. express.Router()
C. app.router()
D. new Router()

Correct: B

Explanation: express.Router creates router.

34. How to export router?

A. export router
B. module.exports
C. exports.default
D. return router

Correct: B

Explanation: module.exports exports router.

35. What is middleware in Express?

A. A database
B. A function between req and res
C. A route
D. A server

Correct: B

Explanation: Middleware executes between request and response.

36. Which function creates an Express app?

A. express.create()
B. express()
C. app()
D. createExpress()

Correct: B

Explanation: express() creates an app instance.

37. Which object sends the response?

A. req
B. res
C. send
D. next

Correct: B

Explanation: res sends response to client.

38. Which parameter represents error object?

A. err
B. error
C. exception
D. fault

Correct: A

Explanation: err represents error.

39. Which improves Express performance?

A. Blocking code
B. Caching
C. Nested callbacks
D. Sync loops

Correct: B

Explanation: Caching improves performance.

40. Which method starts the Express server?

A. app.run()
B. app.start()
C. app.listen()
D. app.init()

Correct: C

Explanation: app.listen() starts the server.

41. Static files include?

A. HTML, CSS, JS
B. Database files
C. API routes
D. Controllers

Correct: A

Explanation: Static files are frontend assets.

42. Which command installs Express?

A. npm add express
B. npm install express
C. node install express
D. express install

Correct: B

Explanation: npm install express installs Express.

43. Which library tests Express APIs?

A. Jest
B. Supertest
C. Mocha
D. All of the above

Correct: D

Explanation: All can test Express APIs.

44. Which middleware parses cookies?

A. cookie-parser
B. cookies
C. parse-cookie
D. cookie

Correct: A

Explanation: cookie-parser parses cookies.

45. How to scale Express app?

A. Cluster
B. Load balancer
C. PM2
D. All of the above

Correct: D

Explanation: All help scaling.

46. How to group routes?

A. Router
B. Group
C. Module
D. Cluster

Correct: A

Explanation: Router groups routes.

47. Which process manager is recommended?

A. nodemon
B. pm2
C. forever
D. All of the above

Correct: D

Explanation: All are process managers.

48. How do you define a route parameter?

A. /user:id
B. /user/{id}
C. /user/:id
D. /user[id]

Correct: C

Explanation: Route params use :id syntax.

49. Which status code means created?

A. 200
B. 201
C. 204
D. 400

Correct: B

Explanation: 201 means created.

50. Which status code means bad request?

A. 200
B. 201
C. 400
D. 500

Correct: C

Explanation: 400 means bad request.

51. Which status code means internal server error?

A. 404
B. 401
C. 500
D. 403

Correct: C

Explanation: 500 means server error.

52. Which package manages sessions?

A. express-session
B. session-store
C. sessions
D. express-cookie

Correct: A

Explanation: express-session manages sessions.

53. Best practice for security?

A. Expose stack traces
B. Validate input
C. Disable HTTPS
D. Hardcode secrets

Correct: B

Explanation: Validating input improves security.

54. Best practice for routes?

A. Large files
B. Separate routers
C. Inline logic
D. Global handlers

Correct: B

Explanation: Separate routers improve maintainability.

55. How to access route parameters?

A. req.params
B. req.query
C. req.body
D. req.route

Correct: A

Explanation: req.params accesses route params.

56. Which protects against XSS?

A. helmet
B. xss-clean
C. secure
D. Both A and B

Correct: D

Explanation: Helmet and xss-clean protect.

57. Which middleware parses JSON body?

A. bodyParser.json()
B. express.json()
C. json.parse()
D. parse.json()

Correct: B

Explanation: express.json parses JSON body.

58. Which command starts Express app?

A. npm start
B. node app.js
C. Both A and B
D. express start

Correct: C

Explanation: Both start the app.

59. Which method redirects client?

A. res.forward()
B. res.move()
C. res.redirect()
D. res.route()

Correct: C

Explanation: res.redirect redirects.

60. Which method handles GET requests?

A. app.get()
B. app.post()
C. app.put()
D. app.delete()

Correct: A

Explanation: app.get() handles GET requests.

express MCQ Mock Test

Your Performance

express MCQs with Answers

1. Which package prevents CSRF?

2. Which template engine is commonly used?

3. CSRF stands for?

4. Which method sends JSON response?

5. Which HTTP method is idempotent?

6. How to access query parameters?

7. Which middleware enables CORS?

8. How many arguments error middleware has?

9. How to handle async errors?

10. What is Express.js?

11. PATCH is used for?

12. Winston is used for?

13. Unhandled promise rejection causes?

14. Which package enables compression?

15. Which package loads env variables?

16. Which function serves static files?

17. Session data is stored in?

18. Which method renders a template?

19. Which object represents the request?

20. Which method handles POST requests?

21. Which function passes control to next middleware?

22. REST API usually returns?

23. Which middleware secures HTTP headers?

24. Where should error middleware be placed?

25. Which design principle REST follows?

26. Which object holds headers?

27. Which method sets status code?

28. Express.js is built on top of which platform?

29. Which middleware parses URL encoded data?

30. Which middleware logs requests?

31. Which header defines content type?

32. XSS stands for?

33. Which function creates router?

34. How to export router?

35. What is middleware in Express?

36. Which function creates an Express app?

37. Which object sends the response?

38. Which parameter represents error object?

39. Which improves Express performance?

40. Which method starts the Express server?

41. Static files include?

42. Which command installs Express?

43. Which library tests Express APIs?

44. Which middleware parses cookies?

45. How to scale Express app?

46. How to group routes?

47. Which process manager is recommended?

48. How do you define a route parameter?

49. Which status code means created?

50. Which status code means bad request?

51. Which status code means internal server error?

52. Which package manages sessions?

53. Best practice for security?

54. Best practice for routes?

55. How to access route parameters?

56. Which protects against XSS?

57. Which middleware parses JSON body?

58. Which command starts Express app?

59. Which method redirects client?

60. Which method handles GET requests?