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.

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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 is NOT a JSON data type?

A) String

B) Null

C) Date

D) Boolean

2 / 30

2. Which JavaScript function converts JSON data into a format suitable for POST requests?

A) JSON.parse()

B) JSON.compress()

C) JSON.encode()

D) JSON.stringify()

3 / 30

3. How do you represent a key-value pair where the value is an array?

A) [ { "key": "value1" } ]

B) { "key": "value1", "value2" }

C) { "key": { "value1": "value2" } }

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

4 / 30

4. What is the best approach to log sensitive information within JSON responses?

A) Log the raw JSON data as is

B) Use a secure logging framework and mask sensitive data

C) Use JSON.stringify()

D) Avoid logging altogether

5 / 30

5. Which browser's developer tools are commonly used to debug JSON in web applications?

A) Firefox

B) Google Chrome

C) Safari

D) Internet Explorer

6 / 30

6. How do you specify that a JSON object must have at least one key in JSON Schema?

A) minProperties: 1

B) required: true

C) minKeys: 1

D) minItems: 1

7 / 30

7. How are multiple key-value pairs separated in a JSON object?

A) Dot

B) Hyphen

C) Semicolon

D) Comma

8 / 30

8. Which of the following values can be used as JSON keys?

A) Strings and numbers

B) Any data type

C) Strings only

D) Strings and booleans

9 / 30

9. What will JSON.stringify(true) return?

A) "True"

B) "true"

C) true

D) Throws an error

10 / 30

10. What is the typical file extension for JSON files?

A) .xml

B) .js

C) .json

D) .txt

11 / 30

11. Which method is used to convert a JavaScript object into a JSON string?

A) JSON.toString()

B) JSON.stringify()

C) JSON.parse()

D) JSON.encode()

12 / 30

12. Which of the following tools can debug REST API calls and their JSON responses?

A) Notepad++

B) Visual Studio Code

C) JSONLint

D) Postman

13 / 30

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

A) JSON.debug()

B) JSON.stringify()

C) JSON.parse()

D) JSON.minify()

14 / 30

14. How can you handle errors when parsing JSON in JavaScript?

A) JSON parsing cannot produce errors

B) Using a try...catch block

C) Using the JSON.validate() method

D) Checking the JSON string with isValid()

15 / 30

15. What does the Content-Type header specify in an API request?

A) The format of the data being sent or expected

B) The size of the request body

C) The status of the response

D) The HTTP method to be used

16 / 30

16. Which online tool is commonly used to format JSON for readability?

A) JSONLint

B) Visual Studio Code

C) Postman

D) GitHub

17 / 30

17. What is the correct JSON format for a boolean value?

A) "true" or "false"

B) True or False

C) TRUE or FALSE

D) true or false

18 / 30

18. Which character is used to enclose a JSON array?

A) {}

B) ()

C) []

D) <>

19 / 30

19. Which of the following is a valid JSON string?

A) 'Hello'

B) "Hello"

C) “Hello”

D) Hello

20 / 30

20. Can JSON keys have spaces?

A) Yes, with quotes

B) Yes, without quotes

C) No

D) Only in arrays

21 / 30

21. Which of these is NOT true about JSON?

A) JSON keys must always be strings

B) JSON is lightweight and language-independent

C) JSON supports single-line and multi-line comments

D) JSON is commonly used for APIs

22 / 30

22. How does JSON web encryption (JWE) enhance JSON security?

A) It compresses JSON data

B) It converts JSON to binary format

C) It encrypts JSON payloads for secure transmission

D) It adds authentication to JSON

23 / 30

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

A) Postman

B) jq

C) JSONLint

D) JSON Formatter

24 / 30

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

A) Minify the JSON data

B) Use large nested objects

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

D) Convert JSON to XML

25 / 30

25. What is JSON primarily used for?

A) Sending emails

B) Creating animations

C) Data exchange between a client and a server

D) Styling web pages

26 / 30

26. Which of these web technologies heavily relies on JSON for communication?

A) HTTP/2

B) WebSockets

C) SOAP

D) GraphQL

27 / 30

27. Which of the following is an example of a valid JSON number?

A) "123"

B) 123.45

C) Both B and C

D) 123

28 / 30

28. What does the .eslintrc.json file configure in JavaScript projects?

A) Server configurations

B) Database schemas

C) Linting rules and code quality settings

D) Project dependencies

29 / 30

29. What type of data does a JSON object contain?

A) Only numbers

B) Only arrays

C) Key-value pairs

D) Only text

30 / 30

30. Which of the following JSON data types is valid?

A) String

B) Object

C) Float

D) All of the above

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