JSON interview questions for experienced/JSON Interview Questions and Answers for Freshers & Experienced

Why is JSON a Popular Tool Nowadays?

JSON is a light-weight software that interchanges the format. It makes it easy for machines to generate and understand and for humans to write and read. It has recently gained popularity and makes use of readable text that communicates data objects. These consist of attribute-value pairs.

What are the limitations of JSONP?

JSONP is used to bypass the same-origin policy of web browsers. It may seem like a perfect way to get around the restriction but it has its own set of limitations as well. They are:

As all the JSONP calls are made by including a <script> tag, the request made is confined only to the GET method.
It cannot be used for POST or PUT requests.
It can be used only for read-only services and APIs.

Explain JSONP in a simple language.

JSONP is also known as JSON with Padding. It is a communication technique used by the JavaScript programs to call data from a server that is present in a domain, which is different than that of the client. JSONP allows the users to share data without the restriction of the cross-domain or same-origin policy of the system and the environment.

What is the use of JSON.parse in JavaScript?

It is used to parse the data present inside the JSON into objects for using its values.

The syntax used to parse JSON data:

string json = ‘{
"Brand": "Hyundai",
"Name": "Verna",
"Color": “Red”
}’
var obj = JSON.parse(json);
This will convert JSON data into the object from which we can retrieve the data for use with the application.

Name some of the most widely used libraries in .net for JSON?

There are several popular libraries available for JSON in .net. Some of them are:

<> Newtonsoft: It is one of the most widely used frameworks to convert using c#. It is quite famous because of its flexibility and performance. It also supports JSON to XML conversion.

<> DataContractJsonSerializer: This is the built-in library provided by Microsoft for handling JSON objects within the .net environment.

Can a comment be added inside a JSON file?

As per the structure, JSON doesn’t support any comments. Although, a Key or data object can be used to hold your comments. We need to just make sure that during the processing of the JSON, your application ignores the given data element.

Name the browsers that support JSON format?

Support for JSON is included in almost all the new versions of the browsers. Internet Explorer, Chrome, Safari, Mozilla Firefox, etc. all support JSON format.

Can you write an example code in JSON?

The following example shows how to use JSON to store information related to books based on their topic and edition.

{
"book": [

{
"id":"01",
"language": "Java",
"edition": "third",
"author": "Herbert Schildt"
},

{
"id":"07",
"language": "C++",
"edition": "second"
"author": "E.Balagurusamy"
}
]
}

What are the advantages of JOSN?

* It is used while writing JavaScript based applications that includes browser extensions and websites.
* JSON format is used for serializing and transmitting structured data over network connection.
* It is primarily used to transmit data between a server and web applications.
* Web services and APIs use JSON format to provide public data.
* It can be used with modern programming languages.

What is JSON Schema?

JSON Schema is a specification for JSON based format for defining the structure of JSON data.

What is JSON in JavaScript?

JSON is derived from the JavaScript programming language, it is a natural choice to use as a data format in JavaScript. JSON, short for JavaScript Object Notation.

Why do we use JSON in Python?

Python programming language is used to encode and decode JSON objects.

Python encode() function encodes the Python object into a JSON string representation.

Python decode() function decodes a JSON-encoded string into a Python object.

Why do we use JSON in Android?

JSON stands for JavaScript Object Notation.It is an independent data exchange format and is the best alternative for XML.

Android provides four different classes to manipulate JSON data. These classes are JSONArray,JSONObject,JSONStringer and JSONTokenizer.

Explain JSON syntax rules?

There are several rules that describe the structure of the JSON. These are:

<> Data inside a JSON is arranged in key-value pair. The left side represents the key and the data on the right side represents value. Both key and value are separated by a colon “:”.
<> Each set of key-value pair is separated from the other pair by using a comma “,”.
<> Curly braces define the JSON objects. Left curly brace “{“ represents the start of the object and right curly brace “}” represents the end of an object.
<> Arrays are defined inside a JSON object by using square brackets “[ ]”.

What is JSON Viewer?

JSON Viewer – Convert JSON Strings to a Friendly Readable Format.

What is JSON Formatter?

The JSON Formatter & Validator helps debugging JSON data by formatting and validating JSON data so that it can easily be read by human beings.

Why do we use JSON in PHP?

A common use of JSON is to read data from a web server, and display the data in a web page. This chapter will teach you how to exchange JSON data between the client and a PHP server.

What is the use of JSON in Java?

The Java API for JSON Processing provides portable APIs to parse, generate, transform, and query JSON. JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write.

What is serialization of an object?

To serialize an object means to convert its state to a byte stream so that the byte stream can be reverted back into a copy of the object.

What is serialization and deserialization in JSON?

JSON is a format that encodes objects in a string. Serialization means to convert an object into that string, and deserialization is its inverse operation. When transmitting data or storing them in a file, the data are required to be byte strings, but complex objects are seldom in this format.

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