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JSON Interview Questions and Answers

Ques 1. Who is the Father of JSON ?

Ans. Douglas Crockford is the Creator or Father of JSON.

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Ques 2. What is JSON?
Ans. JSON full form is JavaScript Object Notation. JSON is a lightweight text-based open standard designed for human-readable data interchange. It is derived from the JavaScript programming language for representing simple data structures and associative arrays, called objects. And JSON is language-independent, with parsers available for virtually every programming language. Uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python,php
The JSON format is often used for serializing and transmitting structured data over a network connection. When third party data interchane(REST Services) then JSON may used there LIKE SHOP .It is primarily used to transmit data between a server and web application, serving as an alternative to XML.
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Ques 3. What is the file extension of JSON?
Ans. The JSON filename extension is .json.
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Ques 4. Explain JSON with php.
Ans. Json is too much easy with php There is no installation needed to use these functions; they are part of the PHP core. nothing more need to know just only use { ,[ and create json format string and use three php function json_encode() to get JSON representation of a value, json_decode() for Decodes a JSON string, ¦json_last_error() to get the last error occurred in process.

Example:
$string=\'{
\"firstName\": \"Rohit\",
\"lastName\": \"Singh\",
\"age\": 26,
\"address\": {
\"streetAddress\": \"Mira Road Thane \",
\"city\": \"Mumbai\",
\"state\": \"maharshtra\",
\"postalCode\": \"401107\"
},
\"phoneNumber\": [
{ \"type\": \"home\", \"number\": \"022 333-1234\" },
{ \"type\": \"fax\", \"number\": \"022 444-4567\" }
]
}\';

$decodeString = json_decode($string);
echo \'First Name - \'.$decode->{\"firstName\"};
echo \'Last Name - \'.$decode->{\"lastName\"};
echo \'Address - \'.$decode->{\"address\"}->{\"streetAddress\"};

Out put : Print below

First Name - Rohit
Last Name - Singh
Address - Mira Road Thane
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Ques 5. Why use JSON over XML?
Ans. • Lighter and faster than XML as on-the-wire data format
• JSON objects are typed while XML data is typeless
> JSON types: string, number, array, boolean,
> XML data are all string
• Native data form for JavaScript code
> Data is readily accessible as JSON objects in your JavaScript
code vs. XML data needed to be parsed and assigned to variables through tedious DOM APIs
> Retrieving values is as easy as reading from an object property in your JavaScript code
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