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Types of JSON Interview Questions and Answers

JSON Interview Questions For Beginners

1. What is JSON?

JSON is a data storage and communication format which is light in weight. This format is easy to read and write for the users. The machines can also parse and generate it easily. This data interchange format is based on a key-value pair of JavaScript object literals. 

2. Can JSON be considered a programming language?

No, JSON is not specifically a programming language but it can be classified under language as it shares its syntax with a JavaScript literals subset. To be more precise, JSON is a data format. 

3. What do you mean by JSON data?

Data as in JSON is simply information. This information can be used to exchange data between a server and a web application. It can be used instead of XML. 

4. What are the programming languages that can be supported by JSON?

JSON is capable of using conventions that are similar to that of the C- family of languages. This includes C, C++, Java, JavaScript, Perl, Python, and so on.

5. What is your understanding of the JSON objects?

A set of name or value pairs if not ordered can be called an object. The convention is that any object in JSON should be included inside the curly braces wherein a colon follows each name and a comma separates the name/ value pairs.

6. Why should you prefer JSON over the other data interchange formats or XML?

JSON is comparatively easy to write and the applications of JSON can be more easily used than that of XML. In other words, JSON possesses simpler syntax than XML. Moreover, being a wire data format, JSON is faster and lighter than XML. The data of XML are all strings while that of JSON are number, array, Boolean, and string.

7. How is JSON limited?

The data structure of JSON is less robust because it cannot handle very complex and large data. JSON is less compatible in the case of combining information sets of various systems. It is not capable of directly holding good for the extension of base types.

8. List out the syntax rules that are framed to describe the structure of JSON?

  •  Key-value pairs are the data. The arrangement is such that the key is kept to the left side and the value is placed on the right side. Key and value are separated by a colon.
  • A comma is used to separate each piece of data.
  • The objects are held within the curly brackets.
  • The arrays are included within the square brackets.

9. Write down a simple JSON format.

"book": [
"language": "Java",
"edition": "third",
"author": "Herbert Schildt"
"language": "C++",
"edition": "second"
"author": "E.Balagurusamy"

10. List out the purposes of JSON?

For the purpose of serializing and transmitting the data structures over a network connection, we prefer to use JSON. Or simply it is used to exchange data between a server and web application. This format is compatible with modern programming languages. In order to provide public data, the web service and APIs make use of JSON format. 

11. Mention the file extension of JSON?

.json is the file extension of JSON.

12. How is XML similar to JSON?

  • Both these formats are capable of transferring data between different systems. 
  • They can easily read and possess simple structures. 
  • They are independent languages. 
  • Nested and hierarchical structures are supported by both these formats. 
  • With various programming, it is possible to parse these formats. 
  • XML and JSON hold good support for Unicode. 

13. What are all the browsers capable of supporting JSON format?

Almost all the new versions of the browser are capable of supporting this format. Some of them are Internet Explorer, Chrome, Safari, Mozilla Firefox, and so on.

14. What do you mean by JSON- RPC?

It is a remote procedure called protocol that is more like the XML- RPC but weighs less and faster than the latter. 

15. What do you mean by JSON Parser?

JSON data is parsed into objects using the parser. This is done in order to use its value. 

16. What is the purpose of using the “eval” function?

JSON text is converted into an object with the help of the “eval” function. 

17. List out the data types that JSON can support?

  • Number
  • String
  • Boolean
  • Array
  • Object
  • Null 

18. What is a number in JSON?

JSON Numbers are similar to C or Java numbers. The only difference is that the octal and hexadecimal formats cannot be used in this format. Decimal digits with no superfluous leading zero, when put in a sequence, form a number. Any values that cannot be expressed as a sequence of digits are restricted from use. 

19. What is the syntax for JSON Arrays?

An array structure usually has the values included in a pair of square bracket tokens within which the values are separated by commas.

{ "letters" : [ "a", "b", "c" ] } 

20. Which function do you use to change JSON text into a string and save it the same?

JSON.stringify() can be used to change JSON text into a string and save it. 

21. What is serialization in JSON?

The conversion of an object into a string is called serialization. 

22. Can JSON be called a markup language?

No, JSON is not a markup language. JSON is just a lighter version of XML for the purpose of structuring data in a text format. We can make data exchanges over the internet using JSON. 

23. How do you get a JSON array from a string?

First of all, create JSON objects for all of your objects separately. Add them to the JSON array. 

24. What do you mean by JSON Schema?

In order to define the structure of JSON data, JSON Schema which is a JSON-based format is used. 

25. Explain JSONP?

JSON with Padding is what we call JSONP. It is used to eliminate cross-domain issues while sending JSON data. without worrying about cross-domain issues.

About Author


Liam Plunkett

Solution Architect

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