JSON Interview Questions and Answers

It is text-based standard design for interchange the information Between two or more different application. It is also very light as compare to XML and human readable.

JavaScript Object Notation.

Douglas Crockford

Douglas Crockford

• It is light weight standard for exchange information
• It is independent of language
• It is independent of Hosting Server
• Human Readable
• Easy to Encode
• Easy to Decode
• Used in Mobile application

It is used to transfer the information between two application. Information can also be exchanged between two different application which is running on different OR same server. It is used in Web Application, Mobile Application (IOS, Android, Iphone, window Phone)

.json

• It is light weight standard for exchange information.
• Human readable
• Easy to parse in PHP as well as in javaScript.
• Due to light weight It is fast.

• It as an object, structure, or associative array where we stored data an ordered list.
• Each value have an key
• once key may have an further object
• Its lightweight that’s why used in android application
• A JSON object begins with { and ends with } (braces)
• Each name is followed by : (colon) and the name/value pairs are separated by , (comma)

JSON support is included in newer browsers and in the newest ECMAScript (JavaScript) standard.

Firefox (Mozilla)

Internet Explorer

Chrome

Opera

Safari

JSON Parser is used to parse the JSON data into object to use its value. JSON can be parse by javaScript, jQuery and PHP.

Remote Procedure call protocol with use of JSON. It is similar to XML-RPC only difference, It use JSON instead of XML.

JSON-RPC-Java is a Java implementation of the JSON-RPC protocol.

$array = array(‘name’=>’interviewgig’,’Description’=>’Web technology experts notes’);

echo json_encode($array);

$object='{“name”:”interviewgig”,”Description”:”Expert in web technology”}’;

$array = json_decode($object);

var json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’

    var obj = JSON.parse(json);

    //alert(obj.name);

var obj = {};

    obj[‘name’]=’interviewgig.blogspot.in’; //string

    obj[‘age’] = 32;  // integer.

    obj[‘marks’]= [80,70,60,50,60,80]; //array

var json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’

    obj = $.parseJSON(json);

    //alert(obj.name);

$json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’;

$obj = json_decode($json);

if(is_null($obj)) {

 die(‘Invalid JSON’);

}

function isValidJson(jsonData) {

    try {

        JSON.parse(jsonData);

        return true;

    } catch (e) {

        return false;

    }

}

var json = ‘{“name”:”Interviewgig”,”Description”:”Web technology experts notes”}’

isValidJson(json);

function isValidJson(jsonData) {

    try {

        $.parseJSON(jsonData);

        return true;

    } catch (e) {

        return false;

    }

}

var json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’

isValidJson(json);

var json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’

JSON.stringify(json)

var json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’

JSON.stringify(json)

var json = ‘{“name”:”interviewgig”,”Description”:”Web technology experts notes”}’

obj = $.parseJSON(json)

$.ajax({

  dataType: “json”,

  url: ‘/ajax/url’,

  data: ‘name=interview gig interview’,

  success: function(data){

  //data

  }

});

http://jsonlint.com/

http://www.freeformatter.com/json-validator.html

Answer: http://jsonlint.com/

http://www.freeformatter.com/json-validator.html

http://jsonviewer.stack.hu/

http://json.parser.online.fr/