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

What is the purpose of the dependencies keyword in JSON Schema?

A) To validate nested objects

B) To define key dependencies

C) To define type constraints

D) To specify default values

2 / 30

Which data structure is JSON closest to?

A) Relational tables

B) Trees

C) Arrays

D) Key-value store

3 / 30

Which of the following JSON data types is valid?

A) Float

B) All of the above

C) String

D) Object

4 / 30

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

A) It encrypts JSON payloads for secure transmission

B) It converts JSON to binary format

C) It compresses JSON data

D) It adds authentication to JSON

5 / 30

What does the title keyword do in JSON Schema?

A) Gives a short label to the schema or property

B) Provides a description of the schema

C) Specifies a string pattern

D) Sets a required field

6 / 30

Which of these is a valid JSON array of strings?

A) ["apple", 'banana', "cherry"]

B) [apple, banana, cherry]

C) ["apple", "banana", "cherry"]

D) ['apple', 'banana', 'cherry']

7 / 30

Can a JSON key have a number as its name?

A) Yes, without quotes

B) Only in arrays

C) Yes, with quotes

D) No

8 / 30

What is JSON Schema?

A) A format to store JSON data

B) A specification to define and validate the structure of JSON data

C) A method to minify JSON files

D) A library to parse JSON data

9 / 30

Which JavaScript method can convert an object into a JSON string for an API request?

A) JSON.encode()

B) JSON.serialize()

C) JSON.parse()

D) JSON.stringify()

10 / 30

Which HTTP method is typically used for sending data to an API?

A) GET

B) POST

C) DELETE

D) OPTIONS

11 / 30

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

A) JSONLint

B) Google Docs

C) JSON Editor Online

D) JIRA

12 / 30

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

A) Functions are converted to strings

B) Functions are ignored

C) Adds null in place of functions

D) Throws an error

13 / 30

What does a JSON compressor do?

A) Removes unnecessary whitespace for smaller size

B) Converts JSON to XML

C) Beautifies JSON

D) Validates JSON

14 / 30

What type of data does a JSON object contain?

A) Key-value pairs

B) Only text

C) Only arrays

D) Only numbers

15 / 30

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

A) format

B) regex

C) match

D) pattern

16 / 30

Which of the following files often uses JSON for configuration?

A) config.txt

B) settings.json

C) preferences.ini

D) config.xml

17 / 30

Which JSON data type is used to represent a collection of items?

A) Object

B) Number

C) Array

D) String

18 / 30

Which tool is used to validate JSON syntax?

A) Postman

B) XMLParser

C) JSONLint

D) JSONParser

19 / 30

What is one method to detect changes in JSON data?

A) Hashing the JSON content

B) Removing whitespace from JSON

C) Beautifying the JSON

D) Using nested structures

20 / 30

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

A) DELETE

B) GET

C) POST

D) PUT

21 / 30

Which keyword defines a numeric range in JSON Schema?

A) range

B) min and max

C) minimum and maximum

D) numberRange

22 / 30

Which of the following is a valid JSON string?

A) "Hello"

B) Hello

C) 'Hello'

D) “Hello”

23 / 30

How can you format JSON output with spaces using JSON.stringify()?

A) Pass a null parameter to JSON.stringify()

B) Use the JSON.stringify(obj, null, 4) method

C) Add a spaces property to the JSON object

D) Use JSON.prettyPrint()

24 / 30

What does JSON stand for?

A) Java Syntax Object Notation

B) JavaScript Online Network

C) JavaScript Object Notation

D) Java Online Syntax Network

25 / 30

How do you identify invalid JSON in a web application?

A) Use the browser's developer tools

B) All of the above

C) Log errors in the console

D) Use a linter or formatter tool

26 / 30

What will be the output of the code: JSON.stringify({ key1: "value1", key2: function() { return "value2"; } });

A) {"key1": "value1", "key2": null}

B) {"key1": "value1"}

C) {"key1": "value1", "key2": "value2"}

D) Throws an error

27 / 30

What is the MIME type for JSON?

A) application/json

B) text/plain

C) text/json

D) application/javascript

28 / 30

Which of the following methods can help trace JSON parsing errors in JavaScript?

A) try...catch blocks around JSON.parse()

B) JSON.log()

C) window.debug()

D) console.parse()

29 / 30

Why is it important to validate JSON data received from external sources?

A) To compress JSON

B) To convert JSON into JavaScript objects

C) To prevent unexpected errors and security vulnerabilities

D) To improve parsing speed

30 / 30

How do you represent a null value in JSON?

A) "null"

B) NULL

C) (null)

D) null

Your score is

The average score is 39%

Rate Your Experience!

Anonymous feedback

Thank you for your feedback! We appreciate your input.

10 Minutes SQL Quiz Test Online

Docker Quiz Test Online (30 random Questions)

Online Quiz Test (with time limit)

10 Minutes Bootstrap Quiz Test Online

SQL Quiz Test Online (30 random Questions)

MongoDB Quiz Test Online (30 random Questions)

Related