JSON Quiz Test Online (30 random Questions) 2026

This quick 30-minute challenge consists of 30 random multiple-choice questions designed to test your knowledge across various JSON topics, including the introduction to JSON, JSON syntax and basics, data types, operations in JavaScript, APIs and JSON, advanced structures, JSON Schema, tools and debugging, as well as performance and security considerations. Whether you’re new to JSON or looking to refine your skills, this quiz will enhance your understanding of JSON’s role in modern web development.

0 votes, 0 avg

You have 30 minutes to complete the quiz. The timer will start when you click the 'Start Quiz' button. Please ensure you are ready before beginning.

Time is up! Your quiz has ended. Your responses have been submitted automatically.

30 Minutes JSON Quiz Test Online

Welcome to the JSON Quiz! This quick 30-minute challenge consists of 30 random multiple-choice questions designed to test your knowledge across various JSON topics, including the introduction to JSON, JSON syntax and basics, data types, operations in JavaScript, APIs and JSON, advanced structures, JSON Schema, tools and debugging, as well as performance and security considerations. Whether you're new to JSON or looking to refine your skills, this quiz will enhance your understanding of JSON's role in modern web development.

1 / 30

1. Which of the following status codes indicates a successful API request?

A) 200

B) 403

C) 404

D) 500

2 / 30

2. What does a JSON array of objects look like?

A) [ "object1", "object2" ]

B) { "object1": "value1", "object2": "value2" }

C) [ { "key": "value" }, { "key": "value" } ]

D) { "array": [ "value1", "value2" ] }

3 / 30

3. Which tool can convert a JSON file into a different format like CSV?

A) jq

B) JSON Formatter

C) Postman

D) JSONLint

4 / 30

4. What happens when you use JSON.parse() on an invalid JSON string?

A) Throws a SyntaxError

B) Returns null

C) Skips invalid parts

D) Converts to an empty object

5 / 30

5. What is a common use of JSON in mobile applications?

A) Compiling source code

B) Exchanging data with remote APIs

C) Defining app layouts

D) Managing memory allocation

6 / 30

6. How is JSON used in data interchange for machine learning models?

A) To train models directly

B) To render visualizations

C) To serialize model configurations and results

D) To compile machine learning libraries

7 / 30

7. What is the primary function of JSON.stringify(value, replacer, space)?

A) Beautifies JSON output

B) Converts an object to a string with formatting options

C) Compresses JSON output

D) Converts JSON to XML

8 / 30

8. Which data structure is not directly supported by JSON?

A) Object

B) Array

C) Set

D) String

9 / 30

9. How can JSON responses be protected from being cached by unauthorized users?

A) Convert JSON to XML

B) Minify the JSON data

C) Use large nested objects

D) Use the Cache-Control header with no-store

10 / 30

10. Which keyword restricts the number of items in a JSON array?

A) minLength

B) arrayLimit

C) maxItems

D) maxSize

11 / 30

11. How does JSON.stringify() handle functions in objects?

A) Functions are ignored

B) Functions are converted to strings

C) Throws an error

D) Adds null in place of functions

12 / 30

12. Which of these techniques can prevent excessive JSON data exposure in APIs?

A) Compressing JSON

B) Using JSON.stringify()

C) Avoiding nested JSON structures

D) Enabling strict validation in APIs

13 / 30

13. What is the purpose of an API key in requests?

A) To authenticate the client

B) To encrypt the request data

C) To specify the API version

D) To indicate the request priority

14 / 30

14. How do you check if a given JavaScript object is a valid JSON object?

A) Use typeof to check if it is an object

B) Use Array.isArray()

C) Use Object.prototype.toString()

D) Convert it to a string using JSON.stringify() and back using JSON.parse()

15 / 30

15. How do you merge two JSON objects?

A) Use JSON.stringify()

B) Use array.push()

C) Use Object.assign()

D) Use JSON.merge()

16 / 30

16. What is a common use of JSON in analytics platforms?

A) Defining UI components

B) Storing raw event data

C) Compiling JavaScript files

D) Generating static reports

17 / 30

17. How are floating-point numbers represented in JSON?

A) float(1.23)

B) "1.23"

C) 1.23f

D) 1.23

18 / 30

18. Can a JSON key have a number as its name?

A) No

B) Only in arrays

C) Yes, with quotes

D) Yes, without quotes

19 / 30

19. What is the MIME type for JSON?

A) application/json

B) application/javascript

C) text/plain

D) text/json

20 / 30

20. What is a safe alternative to eval() for parsing JSON in JavaScript?

A) JSON.stringify()

B) JSON.parse()

C) JSON.debug()

D) JSON.minify()

21 / 30

21. What does the Accept header specify in an API request?

A) The data format expected in the response

B) The authentication type

C) The server's API version

D) The client type

22 / 30

22. How do you handle errors in a fetch() request?

A) Using try...catch blocks or then().catch() methods

B) Using the error property of the response

C) Errors cannot be handled in fetch()

D) Using fetchError() function

23 / 30

23. How do you validate that a JSON object has no additional fields?

A) additionalFields: false

B) additionalProperties: false

C) maxProperties: 0

D) properties: []

24 / 30

24. How are elements in a JSON array separated?

A) Colons

B) Semicolons

C) Commas

D) Dots

25 / 30

25. How does HTTPS improve the security of JSON data transmission?

A) It validates JSON schemas

B) It beautifies JSON responses

C) It encrypts JSON data in transit

D) It makes JSON larger

26 / 30

26. Which of the following best describes JSON?

A) A markup language like XML

B) A programming language

C) A database system

D) A lightweight data format

27 / 30

27. Which HTTP method is commonly used to fetch JSON data from an API?

A) GET

B) DELETE

C) PUT

D) POST

28 / 30

28. What is the purpose of using JSON Web Tokens (JWT)?

A) To convert JSON into binary format

B) To validate and secure data transmission

C) To replace JSON

D) To beautify JSON

29 / 30

29. How do you specify a pattern for a string in JSON Schema?

A) pattern

B) format

C) regex

D) match

30 / 30

30. Which of the following tools allows real-time collaboration on JSON data?

A) Google Docs

B) JIRA

C) JSON Editor Online

D) JSONLint

Your score is

The average score is 41%

Rate Your Experience!

Anonymous feedback

Thank you for your feedback! We appreciate your input.

10 Minutes HTML Quiz Test Online

SQL Quiz Test Online (30 random Questions)

10 Minutes CSS Quiz Test Online

Angular Quiz Test Online (30 random Questions)

HTML Quiz Test Online

CSS Quiz Test Online (30 random Questions)

Related